diff --git a/B05_Profile/logic/B05_Profile_UI_Profile_Alignment.ts b/B05_Profile/logic/B05_Profile_UI_Profile_Alignment.ts
index c835a47e8..eaee72c90 100644
--- a/B05_Profile/logic/B05_Profile_UI_Profile_Alignment.ts
+++ b/B05_Profile/logic/B05_Profile_UI_Profile_Alignment.ts
@@ -13,6 +13,8 @@
  *   - 편집 델타는 항상 **자동 선형(base_pvi) 기준**이라 키를 지우면 정확히 원복된다.
  * ========================================================================== */
 
+import { pivotAxes } from "./B05_Profile_UI_Profile_Pivot";
+
 export interface AlignmentPolicy {
   station_interval_m: number;
   curve_radius_ratio: number;
@@ -552,6 +554,7 @@ const FEEDBACK_TOLERANCE_M = 1e-4;
  * 변화점이 새로 생기면 종단곡선의 중앙종거만큼 계획고가 함께 내려가(또는 올라가)
  * 버튼 1클릭이 정확히 0.1m가 되지 않는다. **화면에 보이는 계획고**가 정확히 delta만큼
  * 움직이도록 중앙종거 변화분을 몇 번 되먹여 보정한다.
+ * 누른 점이 꺾임이면 이웃 꺾임(`pivotAxes`)을 축으로 사이 측점이 새 직선 위로 따라 돈다(355-1).
  */
 export function adjustStation(
   base: AlignmentBase,
@@ -562,17 +565,24 @@ export function adjustStation(
   const key = chainageKey(chainageM);
   const current = buildAlignment(base, edits);
   const target = planElevationAt(current, chainageM) + delta;
-  const baseElevation = interpolate(
-    base.basePvi.map((node) => node.chainage_m),
-    base.basePvi.map((node) => node.elevation_m),
-    chainageM,
-  );
+  const baseS = base.basePvi.map((node) => node.chainage_m);
+  const baseZ = base.basePvi.map((node) => node.elevation_m);
+  const baseElevation = interpolate(baseS, baseZ, chainageM);
   let offset =
     (edits.station_offsets[key] ?? planElevationAt(current, chainageM) - baseElevation) + delta;
-  const withOffset = (value: number): AlignmentEdits => ({
-    ...edits,
-    station_offsets: { ...edits.station_offsets, [key]: Number(value.toFixed(6)) },
-  });
+  const axes = pivotAxes(current, chainageM);
+  const withOffset = (value: number): AlignmentEdits => {
+    const offsets = { ...edits.station_offsets, [key]: Number(value.toFixed(6)) };
+    const radii = { ...edits.curve_radii };
+    axes?.inner.forEach((chainage) => {
+      const [axisM, axisZ] = chainage < chainageM ? [axes.fromM, axes.fromZ] : [axes.toM, axes.toZ];
+      const z =
+        axisZ + ((baseElevation + value - axisZ) * (chainage - axisM)) / (chainageM - axisM);
+      offsets[chainageKey(chainage)] = Number((z - interpolate(baseS, baseZ, chainage)).toFixed(6));
+      delete radii[chainageKey(chainage)];
+    });
+    return { ...edits, station_offsets: offsets, curve_radii: radii };
+  };
   let next = withOffset(offset);
   for (let pass = 0; pass < FEEDBACK_PASSES; pass += 1) {
     const error = target - planElevationAt(buildAlignment(base, next), chainageM);
diff --git a/B05_Profile/logic/B05_Profile_UI_Profile_Pivot.ts b/B05_Profile/logic/B05_Profile_UI_Profile_Pivot.ts
new file mode 100644
index 000000000..ccc84efc4
--- /dev/null
+++ b/B05_Profile/logic/B05_Profile_UI_Profile_Pivot.ts
@@ -0,0 +1,51 @@
+/* =============================================================================
+ * B05_Profile_UI_Profile_Pivot.ts
+ * 종단 ▲▼ 축 찾기(355-1 · 요구 235-15) — 누른 점이 꺾임(R 있는 점)이면 좌우로 같은
+ * 기울기 마디를 건너 다음 꺾임(없으면 시점 · 종점)을 축으로 삼는다. 사이 측점은
+ * 새 직선(축 → 누른 점 → 축) 위로 따라 돈다(`adjustStation`).
+ *
+ * 처음 계획선은 마디마다 꺾여 축 = 누른 점 ±1 → 사이 측점 없음(옛 동작 그대로).
+ * `B05_Profile_UI_Profile_Alignment` 를 타입으로만 읽는다(순환 import 없음).
+ * ========================================================================== */
+
+import type { ProfileAlignment } from "./B05_Profile_UI_Profile_Alignment";
+
+/** 같은 직선으로 볼 기울기 차이 — `B05_Profile_UI_Profile_Straighten` 과 같은 값. */
+const COLLINEAR_EPSILON = 1e-6;
+const SAME_STATION_M = 1e-6;
+
+export interface PivotAxes {
+  fromM: number;
+  fromZ: number;
+  toM: number;
+  toZ: number;
+  /** 두 축 사이(끝 · 누른 점 제외) 변화점 chainage. */
+  inner: number[];
+}
+
+/** 누른 점이 꺾임이면 두 축과 사이 변화점 — 직선 안쪽 · 시종점 · 변화점 아님이면 null. */
+export function pivotAxes(alignment: ProfileAlignment, chainageM: number): PivotAxes | null {
+  const { pvi, segments } = alignment;
+  const index = pvi.findIndex((node) => Math.abs(node.chainage_m - chainageM) < SAME_STATION_M);
+  if (index <= 0 || index >= pvi.length - 1) return null;
+  const grade = (at: number): number => {
+    const segment = segments[at];
+    return segment && segment.length_m > 1e-12 ? segment.height_m / segment.length_m : 0;
+  };
+  const same = (a: number, b: number): boolean => Math.abs(grade(a) - grade(b)) < COLLINEAR_EPSILON;
+  if (same(index - 1, index)) return null;
+  let from = index - 1;
+  while (from > 0 && same(from - 1, index - 1)) from -= 1;
+  let to = index + 1;
+  while (to < pvi.length - 1 && same(to, index)) to += 1;
+  return {
+    fromM: pvi[from].chainage_m,
+    fromZ: pvi[from].elevation_m,
+    toM: pvi[to].chainage_m,
+    toZ: pvi[to].elevation_m,
+    inner: pvi
+      .slice(from + 1, to)
+      .map((node) => node.chainage_m)
+      .filter((chainage) => Math.abs(chainage - chainageM) >= SAME_STATION_M),
+  };
+}
diff --git a/resources/tester/helper_355_1_pivot_tilt.cjs b/resources/tester/helper_355_1_pivot_tilt.cjs
new file mode 100644
index 000000000..9afd9741f
--- /dev/null
+++ b/resources/tester/helper_355_1_pivot_tilt.cjs
@@ -0,0 +1,150 @@
+/* 355-1 종단 ▲▼ 이웃 꺾임 축 돌림 단위검증 헬퍼 — `B05_Profile_UI_Profile_Alignment.ts` ·
+ * `_Straighten.ts` 를 그 자리에서 트랜스파일해 세 경우를 Node 로 돌린다.
+ * ① 처음 계획선 ▲ = 옛 값 ② 직선화 뒤 꺾임 ▲ = 사이 측점 한 직선 · 축 표고 그대로 · +0.1
+ * ③ 직선 안쪽 ▲ = 옛 값. 옛 값 = 355-1 앞 adjustStation(아래 oldAdjust) 그대로.
+ */
+const fs = require("fs");
+const path = require("path");
+const ts = require(path.join(__dirname, "..", "..", "config", "node_modules", "typescript"));
+
+const ROOT = path.join(__dirname, "..", "..");
+const cache = new Map();
+function loadTs(file) {
+  const full = path.resolve(file);
+  if (cache.has(full)) return cache.get(full);
+  const js = ts.transpileModule(fs.readFileSync(full, "utf8"), {
+    compilerOptions: { module: ts.ModuleKind.CommonJS, target: ts.ScriptTarget.ES2020 },
+  }).outputText;
+  const box = { exports: {} };
+  cache.set(full, box.exports);
+  const localRequire = (request) => {
+    if (request.startsWith(".")) return loadTs(path.join(path.dirname(full), `${request}.ts`));
+    return require(request);
+  };
+  new Function("exports", "module", "require", js)(box.exports, box, localRequire);
+  cache.set(full, box.exports);
+  return box.exports;
+}
+
+const LOGIC = path.join(ROOT, "B05_Profile", "logic");
+const align = loadTs(path.join(LOGIC, "B05_Profile_UI_Profile_Alignment.ts"));
+const straight = loadTs(path.join(LOGIC, "B05_Profile_UI_Profile_Straighten.ts"));
+
+// 전체 측점 폴리라인(20m 간격 · 0~200m) — 서버와 같이 꺾임마다 기본 L 라운드.
+const stations = Array.from({ length: 11 }, (_, i) => i * 20);
+const ground = stations.map((s, i) => 100 + 0.3 * i + (i % 2 ? 0.4 : 0));
+const base = {
+  policy: {
+    station_interval_m: 20,
+    curve_radius_ratio: 1,
+    curve_tangent_max_ratio: 0.5,
+    curve_skip_legal_exception: false,
+    default_curve_length_m: 15,
+    default_curve_radius_m: 300,
+    balance_tolerance_percent: 10,
+    edit_step_m: 0.1,
+    grade_violation_policy: "warn",
+    max_grade_pct: 14,
+    curve_skip_delta_pct: 0,
+    paved: true,
+  },
+  onlyExplicitCurves: false,
+  basePvi: stations.map((s, i) => ({ chainage_m: s, elevation_m: ground[i] })),
+  chainage: stations,
+  ground,
+  stations: stations.map((s) => ({ station_id: `S${s}`, chainage_m: s })),
+};
+
+/** 355-1 앞 adjustStation — 누른 측점 하나만 옮김. */
+function oldAdjust(edits, chainageM, delta) {
+  const key = align.chainageKey(chainageM);
+  const current = align.buildAlignment(base, edits);
+  const target = align.planElevationAt(current, chainageM) + delta;
+  const baseElevation = straight.baseElevationAt(base, chainageM);
+  let offset =
+    (edits.station_offsets[key] ?? align.planElevationAt(current, chainageM) - baseElevation) +
+    delta;
+  const withOffset = (value) => ({
+    ...edits,
+    station_offsets: { ...edits.station_offsets, [key]: Number(value.toFixed(6)) },
+  });
+  let next = withOffset(offset);
+  for (let pass = 0; pass < 4; pass += 1) {
+    const error = target - align.planElevationAt(align.buildAlignment(base, next), chainageM);
+    if (Math.abs(error) < 1e-4) break;
+    offset += error;
+    next = withOffset(offset);
+  }
+  return next;
+}
+
+const sorted = (record) =>
+  Object.fromEntries(
+    Object.keys(record ?? {})
+      .sort()
+      .map((key) => [key, record[key]]),
+  );
+const pviZ = (built, s) => built.pvi.find((n) => Math.abs(n.chainage_m - s) < 1e-6).elevation_m;
+const out = {};
+
+// ① 처음 계획선 — 마디마다 꺾임 → 축 = 누른 점 ±1 · 옛 값과 같음(▲ · ▼).
+{
+  const empty = align.emptyEdits();
+  const up = align.adjustStation(base, empty, 100, 0.1);
+  const down = align.adjustStation(base, empty, 60, -0.1);
+  out.initial = {
+    sameUp:
+      JSON.stringify(sorted(up.station_offsets)) ===
+      JSON.stringify(sorted(oldAdjust(empty, 100, 0.1).station_offsets)),
+    sameDown:
+      JSON.stringify(sorted(down.station_offsets)) ===
+      JSON.stringify(sorted(oldAdjust(empty, 60, -0.1).station_offsets)),
+    upKeys: Object.keys(up.station_offsets),
+    radiiKeys: Object.keys(up.curve_radii ?? {}),
+  };
+}
+
+// ② 40~100 · 100~160 직선화 → 100 = 꺾임 · 두 축 40 · 160 · ▲ 100.
+{
+  let edits = straight.straightenBetween(base, align.emptyEdits(), 40, 100);
+  edits = straight.straightenBetween(base, edits, 100, 160);
+  const before = align.buildAlignment(base, edits);
+  const next = align.adjustStation(base, edits, 100, 0.1);
+  const after = align.buildAlignment(base, next);
+  const p = pviZ(after, 100);
+  const line = (s, aM, aZ) => aZ + ((p - aZ) * (s - aM)) / (100 - aM);
+  const z40 = pviZ(before, 40);
+  const z160 = pviZ(before, 160);
+  out.kink = {
+    planRise: align.planElevationAt(after, 100) - align.planElevationAt(before, 100),
+    pivotRise: p - pviZ(before, 100),
+    axisMove: [pviZ(after, 40) - z40, pviZ(after, 160) - z160],
+    outsideMove: [20, 180].map((s) => pviZ(after, s) - pviZ(before, s)),
+    innerResidual: [60, 80]
+      .map((s) => pviZ(after, s) - line(s, 40, z40))
+      .concat([120, 140].map((s) => pviZ(after, s) - line(s, 160, z160))),
+    innerMoved: [60, 80, 120, 140].map((s) => pviZ(after, s) - pviZ(before, s)),
+    curvesAt: after.curves.map((c) => c.chainage_m).sort((a, b) => a - b),
+    oldWouldBreak: (() => {
+      const old = align.buildAlignment(base, oldAdjust(edits, 100, 0.1));
+      return [80, 120].map((s) => pviZ(old, s) - pviZ(before, s));
+    })(),
+  };
+}
+
+// ③ 직선 안쪽(80 · 40~100 직선 위) — 꺾임 아님 → 옛 값.
+{
+  let edits = straight.straightenBetween(base, align.emptyEdits(), 40, 100);
+  edits = straight.straightenBetween(base, edits, 100, 160);
+  const next = align.adjustStation(base, edits, 80, 0.1);
+  out.inside = {
+    same:
+      JSON.stringify(sorted(next.station_offsets)) ===
+      JSON.stringify(sorted(oldAdjust(edits, 80, 0.1).station_offsets)),
+    planRise:
+      align.planElevationAt(align.buildAlignment(base, next), 80) -
+      align.planElevationAt(align.buildAlignment(base, edits), 80),
+  };
+}
+
+process.stdout.write(JSON.stringify(out));
diff --git a/resources/tester/test_213_1_hidden_station_pvi.py b/resources/tester/test_213_1_hidden_station_pvi.py
index b75c20104..1f2fc4833 100644
--- a/resources/tester/test_213_1_hidden_station_pvi.py
+++ b/resources/tester/test_213_1_hidden_station_pvi.py
@@ -15,6 +15,7 @@ from __future__ import annotations
 
 import copy
 import json
+import re
 import shutil
 import subprocess
 import sys
@@ -136,6 +137,9 @@ def ts_alignment(tmp_path_factory):
         capture_output=True,
     )
     (out / "runner.mjs").write_text(_RUNNER, encoding="utf-8")
+    for js in out.glob("*.js"):  # 355-1 Alignment 이 Pivot 을 부름 — Node ESM 은 확장자 필요
+        text = js.read_text(encoding="utf-8")
+        js.write_text(re.sub(r'(from "\./\w+)"', r'\1.js"', text), encoding="utf-8")
     data = _synthetic()
     base = {
         "policy": AlignmentPolicy.from_dict({}).as_dict(),
diff --git a/resources/tester/test_213_2_ghost_edit_drop.py b/resources/tester/test_213_2_ghost_edit_drop.py
index 2e84ee6e5..203185130 100644
--- a/resources/tester/test_213_2_ghost_edit_drop.py
+++ b/resources/tester/test_213_2_ghost_edit_drop.py
@@ -11,6 +11,7 @@
 from __future__ import annotations
 
 import json
+import re
 import subprocess
 import sys
 from pathlib import Path
@@ -163,6 +164,9 @@ def test_followed_station_ts(tmp_path):
         capture_output=True,
     )
     (out / "runner.mjs").write_text(_RUNNER, encoding="utf-8")
+    for js in out.glob("*.js"):  # 355-1 Alignment 이 Pivot 을 부름 — Node ESM 은 확장자 필요
+        text = js.read_text(encoding="utf-8")
+        js.write_text(re.sub(r'(from "\./\w+)"', r'\1.js"', text), encoding="utf-8")
     src, dst = tmp_path / "in.json", tmp_path / "out.json"
     src.write_text(json.dumps([case for case, _ in CASES]), encoding="utf-8")
     subprocess.run(  # noqa: S603
diff --git a/resources/tester/test_355_1_pivot_tilt.py b/resources/tester/test_355_1_pivot_tilt.py
new file mode 100644
index 000000000..eb24bcbf5
--- /dev/null
+++ b/resources/tester/test_355_1_pivot_tilt.py
@@ -0,0 +1,72 @@
+# -*- coding: utf-8 -*-
+"""355-1 B05 종단 ▲▼ — 누른 점이 꺾임이면 이웃 꺾임을 축으로 사이 직선이 따라 돎(요구 235-15).
+
+계산(`B05_Profile/logic/B05_Profile_UI_Profile_Alignment.ts` adjustStation ·
+`_Pivot.ts` pivotAxes)은 Node 헬퍼(`helper_355_1_pivot_tilt.cjs`)가 트랜스파일해 돌리고,
+부르는 곳 셋(▲▼ 버튼 · 표 값 입력 · 방향키)이 같은 함수인지는 소스로 본다.
+"""
+
+import json
+import os
+import subprocess
+from pathlib import Path
+
+import pytest
+
+HERE = Path(__file__).resolve().parent
+ROOT = HERE.parent.parent
+
+
+def _read(relative: str) -> str:
+    return (ROOT / relative).read_text(encoding="utf-8")
+
+
+@pytest.fixture(scope="module")
+def out():
+    proc = subprocess.run(
+        ["node", os.path.join(HERE, "helper_355_1_pivot_tilt.cjs")],
+        capture_output=True,
+        text=True,
+        encoding="utf-8",
+        timeout=60,
+    )
+    assert proc.returncode == 0, proc.stderr
+    return json.loads(proc.stdout)
+
+
+def test_처음_계획선은_옛_값(out):
+    initial = out["initial"]
+    assert initial["sameUp"] and initial["sameDown"]
+    assert initial["upKeys"] == ["100.000"]
+    assert initial["radiiKeys"] == []
+
+
+def test_꺾임_누르면_사이_측점이_한_직선(out):
+    kink = out["kink"]
+    assert kink["planRise"] == pytest.approx(0.1, abs=1e-4)
+    assert kink["axisMove"] == [0, 0]
+    assert kink["outsideMove"] == [0, 0]
+    assert all(abs(value) < 1e-6 for value in kink["innerResidual"])
+    # 축에서 멀수록 더 오름(40 → 60 → 80 → 100 · 160 → 140 → 120 → 100)
+    moved = kink["innerMoved"]
+    assert 0 < moved[0] < moved[1] < kink["pivotRise"]
+    assert 0 < moved[3] < moved[2] < kink["pivotRise"]
+    # 옛 길은 사이 측점이 그대로라 P±1 에서 꺾였음
+    assert kink["oldWouldBreak"] == [0, 0]
+
+
+def test_직선_안쪽은_옛_값(out):
+    assert out["inside"]["same"]
+    assert out["inside"]["planRise"] == pytest.approx(0.1, abs=1e-4)
+
+
+def test_부르는_곳_셋이_같은_함수():
+    assert "adjustStation(base, store.edits(), chainage, delta)" in _read(
+        "B05_Profile/B05_Profile_UI_Profile_Render.ts"
+    )
+    assert "ctx.applyEdits(adjustStation(base, ctx.edits(), chainage, delta))" in _read(
+        "B05_Profile/B05_Profile_UI_Profile_Panel_Tools.ts"
+    )
+    assert "pivotAxes(current, chainageM)" in _read(
+        "B05_Profile/logic/B05_Profile_UI_Profile_Alignment.ts"
+    )