diff --git a/frontend/components/screen/InteractiveDataTable.tsx b/frontend/components/screen/InteractiveDataTable.tsx
index 8a31756c..c9b24892 100644
--- a/frontend/components/screen/InteractiveDataTable.tsx
+++ b/frontend/components/screen/InteractiveDataTable.tsx
@@ -1921,7 +1921,7 @@ export const InteractiveDataTable: React.FC<InteractiveDataTableProps> = ({
           {visibleColumns.length > 0 ? (
             <>
               <div className="overflow-hidden rounded-lg border border-gray-200/60 bg-white shadow-sm">
-                <Table>
+                <Table style={{ tableLayout: 'fixed' }}>
                   <TableHeader>
                     <TableRow>
                       {/* 체크박스 컬럼 (삭제 기능이 활성화된 경우) */}
@@ -1935,15 +1935,25 @@ export const InteractiveDataTable: React.FC<InteractiveDataTableProps> = ({
                       )}
                       {visibleColumns.map((column: DataTableColumn, columnIndex) => {
                         const columnWidth = columnWidths[column.id];
-                        const defaultWidth = `${((column.gridColumns || 2) / totalGridColumns) * 100}%`;
                         
                         return (
                           <TableHead
                             key={column.id}
+                            ref={(el) => {
+                              // 첫 렌더링 시 실제 너비를 측정해서 상태에 저장
+                              if (el && !columnWidth) {
+                                const measuredWidth = el.offsetWidth;
+                                if (measuredWidth > 0) {
+                                  setColumnWidths(prev => ({
+                                    ...prev,
+                                    [column.id]: measuredWidth
+                                  }));
+                                }
+                              }
+                            }}
                             className="relative bg-gradient-to-r from-gray-50 to-slate-50 px-4 font-semibold text-gray-700 select-none"
                             style={{ 
-                              width: columnWidth ? `${columnWidth}px` : defaultWidth,
-                              minWidth: '80px',
+                              width: columnWidth ? `${columnWidth}px` : undefined,
                               userSelect: 'none'
                             }}
                           >
@@ -1956,10 +1966,13 @@ export const InteractiveDataTable: React.FC<InteractiveDataTableProps> = ({
                                 onClick={(e) => e.stopPropagation()}
                                 onMouseDown={(e) => {
                                   e.preventDefault();
-                                  e.stopPropagation(); // 상위 컴포넌트 드래그 이벤트 방지
+                                  e.stopPropagation();
+                                  
+                                  const thElement = e.currentTarget.parentElement as HTMLTableCellElement;
+                                  if (!thElement) return;
                                   
                                   const startX = e.clientX;
-                                  const startWidth = columnWidth || (e.currentTarget.parentElement?.offsetWidth || 100);
+                                  const startWidth = columnWidth || thElement.offsetWidth;
                                   
                                   // 드래그 중 텍스트 선택 방지
                                   document.body.style.userSelect = 'none';
@@ -1967,12 +1980,23 @@ export const InteractiveDataTable: React.FC<InteractiveDataTableProps> = ({
                                   
                                   const handleMouseMove = (moveEvent: MouseEvent) => {
                                     moveEvent.preventDefault();
+                                    
                                     const diff = moveEvent.clientX - startX;
                                     const newWidth = Math.max(80, startWidth + diff);
-                                    setColumnWidths(prev => ({ ...prev, [column.id]: newWidth }));
+                                    
+                                    // 직접 DOM 스타일 변경 (리렌더링 없음)
+                                    if (thElement) {
+                                      thElement.style.width = `${newWidth}px`;
+                                    }
                                   };
                                   
                                   const handleMouseUp = () => {
+                                    // 최종 너비를 state에 저장
+                                    if (thElement) {
+                                      const finalWidth = Math.max(80, thElement.offsetWidth);
+                                      setColumnWidths(prev => ({ ...prev, [column.id]: finalWidth }));
+                                    }
+                                    
                                     // 텍스트 선택 복원
                                     document.body.style.userSelect = '';
                                     document.body.style.cursor = '';
diff --git a/frontend/lib/registry/components/table-list/TableListComponent.tsx b/frontend/lib/registry/components/table-list/TableListComponent.tsx
index 4fa655e2..6a753734 100644
--- a/frontend/lib/registry/components/table-list/TableListComponent.tsx
+++ b/frontend/lib/registry/components/table-list/TableListComponent.tsx
@@ -1023,19 +1023,30 @@ export const TableListComponent: React.FC<TableListComponentProps> = ({
                 <tr className="h-10 border-b border-border sm:h-12">
                   {visibleColumns.map((column, columnIndex) => {
                     const columnWidth = columnWidths[column.columnName];
-                    const defaultWidth = `${100 / visibleColumns.length}%`;
                     
                     return (
                       <th
                         key={column.columnName}
-                        ref={(el) => (columnRefs.current[column.columnName] = el)}
+                        ref={(el) => {
+                          columnRefs.current[column.columnName] = el;
+                          // 첫 렌더링 시 실제 너비를 측정해서 상태에 저장
+                          if (el && !columnWidth) {
+                            const measuredWidth = el.offsetWidth;
+                            if (measuredWidth > 0) {
+                              setColumnWidths(prev => ({
+                                ...prev,
+                                [column.columnName]: measuredWidth
+                              }));
+                            }
+                          }
+                        }}
                         className={cn(
                           "relative h-10 px-2 py-2 text-xs font-semibold text-foreground overflow-hidden text-ellipsis bg-background select-none sm:h-12 sm:px-6 sm:py-3 sm:text-sm sm:whitespace-nowrap",
                           column.sortable && "cursor-pointer"
                         )}
                         style={{
                           textAlign: column.align || "left",
-                          width: columnWidth ? `${columnWidth}px` : defaultWidth,
+                          width: columnWidth ? `${columnWidth}px` : undefined,
                           userSelect: 'none'
                         }}
                         onClick={() => column.sortable && handleSort(column.columnName)}