diff --git a/frontend/lib/registry/components/v2-split-panel-layout/SplitPanelLayoutComponent.tsx b/frontend/lib/registry/components/v2-split-panel-layout/SplitPanelLayoutComponent.tsx
index 689a2407..05c16943 100644
--- a/frontend/lib/registry/components/v2-split-panel-layout/SplitPanelLayoutComponent.tsx
+++ b/frontend/lib/registry/components/v2-split-panel-layout/SplitPanelLayoutComponent.tsx
@@ -2261,6 +2261,82 @@ export const SplitPanelLayoutComponent: React.FC<SplitPanelLayoutComponentProps>
     [componentConfig, activeTabIndex],
   );
 
+  // 커스텀 모드 우측 패널 저장 (인라인 편집 데이터)
+  const handleCustomRightSave = useCallback(async () => {
+    if (!selectedLeftItem || !customLeftSelectedData || Object.keys(customLeftSelectedData).length === 0) {
+      toast({
+        title: "저장 실패",
+        description: "저장할 데이터가 없습니다. 좌측에서 항목을 선택해주세요.",
+        variant: "destructive",
+      });
+      return;
+    }
+
+    const tableName = componentConfig.rightPanel?.tableName || componentConfig.leftPanel?.tableName;
+    if (!tableName) {
+      toast({
+        title: "저장 실패",
+        description: "테이블 정보가 없습니다.",
+        variant: "destructive",
+      });
+      return;
+    }
+
+    // Primary Key 찾기
+    const sourceColumn = componentConfig.leftPanel?.itemAddConfig?.sourceColumn || "id";
+    const primaryKey = selectedLeftItem[sourceColumn] || selectedLeftItem.id || selectedLeftItem.ID;
+
+    if (!primaryKey) {
+      toast({
+        title: "저장 실패",
+        description: "Primary Key를 찾을 수 없습니다.",
+        variant: "destructive",
+      });
+      return;
+    }
+
+    try {
+      // 프론트엔드 전용 필드 제거
+      const cleanData = { ...customLeftSelectedData };
+      delete cleanData.children;
+      delete cleanData.level;
+      delete cleanData._originalItems;
+
+      // company_code 자동 추가
+      if (companyCode && !cleanData.company_code) {
+        cleanData.company_code = companyCode;
+      }
+
+      console.log("📝 [SplitPanel] 커스텀 우측 패널 저장:", { tableName, sourceColumn, primaryKey, data: cleanData });
+
+      const response = await dataApi.updateRecord(tableName, primaryKey, cleanData);
+
+      if (response.success) {
+        toast({
+          title: "저장 완료",
+          description: "데이터가 저장되었습니다.",
+        });
+        // 좌측 데이터 새로고침 (변경된 항목 반영)
+        loadLeftData();
+        // selectedLeftItem도 업데이트
+        setSelectedLeftItem(customLeftSelectedData);
+      } else {
+        toast({
+          title: "저장 실패",
+          description: response.error || "데이터 저장에 실패했습니다.",
+          variant: "destructive",
+        });
+      }
+    } catch (error) {
+      console.error("커스텀 우측 패널 저장 오류:", error);
+      toast({
+        title: "저장 오류",
+        description: "데이터 저장 중 오류가 발생했습니다.",
+        variant: "destructive",
+      });
+    }
+  }, [selectedLeftItem, customLeftSelectedData, componentConfig, companyCode, toast, loadLeftData]);
+
   // 수정 모달 저장
   const handleEditModalSave = useCallback(async () => {
     const tableName =
@@ -3618,6 +3694,13 @@ export const SplitPanelLayoutComponent: React.FC<SplitPanelLayoutComponentProps>
               </div>
               {!isDesignMode && (
                 <div className="flex items-center gap-2">
+                  {/* 커스텀 모드 기본정보 탭: 저장 버튼 */}
+                  {activeTabIndex === 0 && componentConfig.rightPanel?.displayMode === "custom" && selectedLeftItem && (
+                    <Button size="sm" variant="default" onClick={handleCustomRightSave}>
+                      <Save className="mr-1 h-4 w-4" />
+                      저장
+                    </Button>
+                  )}
                   {activeTabIndex === 0
                     ? componentConfig.rightPanel?.showAdd && (
                         <Button size="sm" variant="outline" onClick={() => handleAddClick("right")}>
@@ -4087,6 +4170,9 @@ export const SplitPanelLayoutComponent: React.FC<SplitPanelLayoutComponentProps>
                               isDesignMode={false}
                               isInteractive={true}
                               formData={customLeftSelectedData}
+                              onFormDataChange={(fieldName: string, value: any) => {
+                                setCustomLeftSelectedData((prev: Record<string, any>) => ({ ...prev, [fieldName]: value }));
+                              }}
                               tableName={componentConfig.rightPanel?.tableName || componentConfig.leftPanel?.tableName}
                               menuObjid={(props as any).menuObjid}
                               screenId={(props as any).screenId}