diff --git a/frontend/components/report/designer/CanvasComponent.tsx b/frontend/components/report/designer/CanvasComponent.tsx
index 238b79a9..554c7065 100644
--- a/frontend/components/report/designer/CanvasComponent.tsx
+++ b/frontend/components/report/designer/CanvasComponent.tsx
@@ -606,7 +606,6 @@ export function CanvasComponent({ component }: CanvasComponentProps) {
         const sigLabelPos = component.labelPosition || "left";
         const sigShowLabel = component.showLabel !== false;
         const sigLabelText = component.labelText || "서명:";
-        const sigShowUnderline = component.showUnderline !== false;
 
         return (
           <div className="h-full w-full">
@@ -653,14 +652,6 @@ export function CanvasComponent({ component }: CanvasComponentProps) {
                     서명 이미지
                   </div>
                 )}
-                {sigShowUnderline && (
-                  <div
-                    className="absolute right-0 bottom-0 left-0"
-                    style={{
-                      borderBottom: "2px solid #000000",
-                    }}
-                  />
-                )}
               </div>
             </div>
           </div>
diff --git a/frontend/components/report/designer/ReportDesignerCanvas.tsx b/frontend/components/report/designer/ReportDesignerCanvas.tsx
index 85dc89b8..6684047b 100644
--- a/frontend/components/report/designer/ReportDesignerCanvas.tsx
+++ b/frontend/components/report/designer/ReportDesignerCanvas.tsx
@@ -319,7 +319,6 @@ export function ReportDesignerCanvas() {
           showLabel: true,
           labelText: "서명:",
           labelPosition: "left" as const,
-          showUnderline: true,
           borderWidth: 0,
           borderColor: "#cccccc",
         }),
diff --git a/frontend/components/report/designer/ReportDesignerRightPanel.tsx b/frontend/components/report/designer/ReportDesignerRightPanel.tsx
index bf401680..7fcfed4e 100644
--- a/frontend/components/report/designer/ReportDesignerRightPanel.tsx
+++ b/frontend/components/report/designer/ReportDesignerRightPanel.tsx
@@ -947,26 +947,6 @@ export function ReportDesignerRightPanel() {
                             </>
                           )}
 
-                          {/* 밑줄 표시 (서명란만) */}
-                          {selectedComponent.type === "signature" && (
-                            <div className="flex items-center gap-2">
-                              <input
-                                type="checkbox"
-                                id="showUnderline"
-                                checked={selectedComponent.showUnderline !== false}
-                                onChange={(e) =>
-                                  updateComponent(selectedComponent.id, {
-                                    showUnderline: e.target.checked,
-                                  })
-                                }
-                                className="h-4 w-4"
-                              />
-                              <Label htmlFor="showUnderline" className="text-xs">
-                                밑줄 표시
-                              </Label>
-                            </div>
-                          )}
-
                           {/* 이름 입력 (도장란만) */}
                           {selectedComponent.type === "stamp" && (
                             <div>
diff --git a/frontend/components/report/designer/ReportPreviewModal.tsx b/frontend/components/report/designer/ReportPreviewModal.tsx
index 0ba67bae..bf0603b7 100644
--- a/frontend/components/report/designer/ReportPreviewModal.tsx
+++ b/frontend/components/report/designer/ReportPreviewModal.tsx
@@ -624,7 +624,6 @@ export function ReportPreviewModal({ isOpen, onClose }: ReportPreviewModalProps)
                 ${showLabel ? `<div style="font-size: 12px; white-space: nowrap;">${labelText}</div>` : ""}
                 <div style="flex: 1; position: relative;">
                   ${imageUrl ? `<img src="${imageUrl}" style="width: 100%; height: 100%; object-fit: ${component.objectFit || "contain"};" />` : ""}
-                  ${component.showUnderline ? '<div style="position: absolute; bottom: 0; left: 0; right: 0; height: 1px; background-color: #000000;"></div>' : ""}
                 </div>
               </div>`;
           } else {
@@ -633,7 +632,6 @@ export function ReportPreviewModal({ isOpen, onClose }: ReportPreviewModalProps)
                 ${showLabel && labelPosition === "top" ? `<div style="font-size: 12px;">${labelText}</div>` : ""}
                 <div style="flex: 1; width: 100%; position: relative;">
                   ${imageUrl ? `<img src="${imageUrl}" style="width: 100%; height: 100%; object-fit: ${component.objectFit || "contain"};" />` : ""}
-                  ${component.showUnderline ? '<div style="position: absolute; bottom: 0; left: 0; right: 0; height: 1px; background-color: #000000;"></div>' : ""}
                 </div>
                 ${showLabel && labelPosition === "bottom" ? `<div style="font-size: 12px;">${labelText}</div>` : ""}
               </div>`;
@@ -1386,17 +1384,6 @@ export function ReportPreviewModal({ isOpen, onClose }: ReportPreviewModalProps)
                                     }}
                                   />
                                 )}
-                                {component.showUnderline !== false && (
-                                  <div
-                                    style={{
-                                      position: "absolute",
-                                      bottom: "0",
-                                      left: "0",
-                                      right: "0",
-                                      borderBottom: "2px solid #000000",
-                                    }}
-                                  />
-                                )}
                               </div>
                             </div>
                           )}
diff --git a/frontend/types/report.ts b/frontend/types/report.ts
index 4241035f..bd0ff896 100644
--- a/frontend/types/report.ts
+++ b/frontend/types/report.ts
@@ -162,7 +162,6 @@ export interface ComponentConfig {
   showLabel?: boolean; // 레이블 표시 여부 ("서명:", "(인)")
   labelText?: string; // 커스텀 레이블 텍스트
   labelPosition?: "top" | "left" | "bottom" | "right"; // 레이블 위치
-  showUnderline?: boolean; // 서명란 밑줄 표시 여부
   personName?: string; // 도장란 이름 (예: "홍길동")
   // 테이블 전용
   tableColumns?: Array<{