diff --git a/apps/as/src/pages/instl-sncn/ui/cnfm-regist-page.tsx b/apps/as/src/pages/instl-sncn/ui/cnfm-regist-page.tsx
index 82e41bbfe..18e419d6f 100644
--- a/apps/as/src/pages/instl-sncn/ui/cnfm-regist-page.tsx
+++ b/apps/as/src/pages/instl-sncn/ui/cnfm-regist-page.tsx
@@ -32,6 +32,24 @@ const emptyAmt = (): BzAmtRow => ({ bscPl: "", budgetReflct: "", thtiDsgn: "" })
 const num = (v: string) => parseFloat(v.replace(/,/g, "") || "0");
 const fmt = (v: number) => (isNaN(v) ? "" : v.toLocaleString());
 
+/* ------------------------------------------------------------------ */
+/* 공통 셀 컴포넌트 (컴포넌트 외부에 선언해야 re-mount 방지)      */
+/* ------------------------------------------------------------------ */
+const NumCell = ({ value, onChange }: { value: string; onChange: (v: string) => void }) => (
+  <td>
+    <input
+      type="text"
+      className="cnfm-input w-full min-w-0 text-right"
+      value={value}
+      onChange={(e) => onChange(e.target.value)}
+    />
+  </td>
+);
+
+const ReadCell = ({ value }: { value: string | number }) => (
+  <td className="bg-gray-50 pr-2 text-right text-[1.25rem] font-semibold">{value}</td>
+);
+
 /* ------------------------------------------------------------------ */
 /* 메인 컴포넌트                                                          */
 /* ------------------------------------------------------------------ */
@@ -180,22 +198,6 @@ function CnfmRegistPage() {
     setter((prev) => ({ ...prev, [col]: val }));
   }
 
-  /* ── 공통 숫자 셀 ── */
-  const NumCell = ({ value, onChange }: { value: string; onChange: (v: string) => void }) => (
-    <td>
-      <input
-        type="text"
-        className="cnfm-input w-full text-right"
-        value={value}
-        onChange={(e) => onChange(e.target.value)}
-      />
-    </td>
-  );
-
-  const ReadCell = ({ value }: { value: string | number }) => (
-    <td className="bg-gray-50 pr-2 text-right text-[1.25rem] font-semibold">{value}</td>
-  );
-
   /* ---------------------------------------------------------------- */
   return (
     <div className="mt-6 space-y-4">
@@ -484,24 +486,20 @@ function CnfmRegistPage() {
           총사업비 <span className="text-[1.2rem] font-normal text-gray-400">(단위: 백만원)</span>
         </h3>
         <div className="cnfm-table-wrap">
-          <table className="cnfm-table">
+          <table className="cnfm-table w-full table-fixed">
             <thead>
               <tr>
-                <th colSpan={2} className="w-[20rem]">
+                <th colSpan={2} className="w-[30rem]" rowSpan={2}>
                   구분
                 </th>
-                <th>예산반영(A)</th>
-                <th>표준사업비(B)</th>
-                <th>금회설계시(C)</th>
+                <th rowSpan={2}>예산반영(A)</th>
+                <th rowSpan={2}>표준사업비(B)</th>
+                <th rowSpan={2}>금회설계시(C)</th>
                 <th colSpan={2}>증감</th>
               </tr>
               <tr>
-                <th colSpan={2}></th>
-                <th></th>
-                <th></th>
-                <th></th>
-                <th>(C-B)</th>
-                <th>%</th>
+                <th className="w-[12rem]">(C-B)</th>
+                <th className="w-[6rem]">%</th>
               </tr>
             </thead>
             <tbody>