diff --git a/frontend/src/utils/ChartManager.ts b/frontend/src/utils/ChartManager.ts
index b8b1e78..60a26ad 100644
--- a/frontend/src/utils/ChartManager.ts
+++ b/frontend/src/utils/ChartManager.ts
@@ -739,6 +739,41 @@ export class ChartManager {
   }
 
   /** 이중 plot 지표 — addIndicator 루프에서 누락된 plot 시리즈 추가 */
+  /**
+   * OBV pane y축 스케일을 최근 N봉 실제 값 기준으로 강제 고정.
+   * 과거에 OBV가 큰 값을 기록했어도 현재 구간이 y축 하단에 압축되지 않도록 방지.
+   */
+  private _applyObvTightScale(
+    seriesList: ISeriesApi<SeriesType>[],
+    plots: Record<string, PlotData>,
+    recentCount = 60,
+  ): void {
+    const allRecent: number[] = [];
+    for (const key of ['plot0', 'plot1']) {
+      const pts = (plots[key] ?? []).filter(p => p.value != null && isFinite(p.value as number));
+      const slice = pts.slice(-recentCount).map(p => p.value as number);
+      allRecent.push(...slice);
+    }
+    if (allRecent.length === 0) return;
+    const minV = Math.min(...allRecent);
+    const maxV = Math.max(...allRecent);
+    const span = Math.max(1, maxV - minV);
+    const pad  = span * 0.3;
+    const tMin = minV - pad;
+    const tMax = maxV + pad;
+    for (const s of seriesList) {
+      try {
+        // eslint-disable-next-line @typescript-eslint/no-explicit-any
+        (s as ISeriesApi<any>).applyOptions({
+          autoscaleInfoProvider: () => ({
+            priceRange: { minValue: tMin, maxValue: tMax },
+            margins: { above: 0, below: 0 },
+          }),
+        });
+      } catch { /* ok */ }
+    }
+  }
+
   private _appendMissingPlotSeriesToLists(
     seriesList: ISeriesApi<SeriesType>[],
     seriesMeta: IndicatorEntry['seriesMeta'],
@@ -812,6 +847,9 @@ export class ChartManager {
         indicatorHidden,
         def,
       );
+      if (config.type === 'OBV' && !indicatorHidden && entry.seriesList.length > 0) {
+        this._applyObvTightScale(entry.seriesList, result.plots as Record<string, PlotData>);
+      }
       entry.config = config;
       if (entry.seriesList.length > 0) {
         const actualPane = this._readSeriesPaneIndex(entry.seriesList[0]);
@@ -911,14 +949,6 @@ export class ChartManager {
           }, pane);
           series.setData(filtered.map(p => ({ time: p.time as Time, value: p.value })));
           seriesMeta.push({ plotId: plotDef.id, isHistogram: false, color: plotDef.color });
-
-          // OBV 디버그: 마지막 5개 값 출력
-          if (config.type === 'OBV') {
-            const last5 = filtered.slice(-5).map(p => p.value.toFixed(2));
-            const minV = Math.min(...filtered.map(p => p.value));
-            const maxV = Math.max(...filtered.map(p => p.value));
-            console.warn(`[OBV-DATA] ${plotDef.id} | last5=${last5.join(',')} | min=${minV.toFixed(2)} max=${maxV.toFixed(2)} | totalPts=${filtered.length}`);
-          }
         }
 
         seriesList.push(series);
@@ -936,6 +966,10 @@ export class ChartManager {
         );
       }
 
+      // OBV: 최근 50봉 값 기준으로 y축 고정 → 과거 큰 값에 의한 스케일 압축 방지
+      if (config.type === 'OBV' && !indicatorHidden && seriesList.length > 0) {
+        this._applyObvTightScale(seriesList, result.plots as Record<string, PlotData>);
+      }
 
       // hlines(과열선/중앙선/침체선)는 첫 번째 시리즈에만 한 번 생성 (중복 방지)
       const hlineRefs: IPriceLine[] = [];
@@ -1052,6 +1086,13 @@ export class ChartManager {
       if (!DUAL_LINE_INDICATOR_TYPES.has(entry.type)) continue;
       await this._ensureDualLinePlotSeriesForEntry(entry);
       if (entry.config) this.applyIndicatorStyle(entry.config);
+      // OBV: tight scale 재적용 (스타일 갱신 후 autoscaleInfoProvider 덮어써질 수 있음)
+      if (entry.type === 'OBV' && entry.seriesList.length > 0 && this.rawBars.length > 0) {
+        try {
+          const result = await calculateIndicator('OBV', this.rawBars.slice(), entry.config?.params ?? {});
+          this._applyObvTightScale(entry.seriesList, result.plots as Record<string, PlotData>);
+        } catch { /* ok */ }
+      }
     }
   }