diff --git a/src/app/api/m/orders/items/update/route.ts b/src/app/api/m/orders/items/update/route.ts
index 5ec64df..9a8983c 100644
--- a/src/app/api/m/orders/items/update/route.ts
+++ b/src/app/api/m/orders/items/update/route.ts
@@ -113,6 +113,43 @@ export async function POST(req: NextRequest) {
 
       const isFree = cur.is_tax_free === "Y";
       const calc = calcLine({ unitPrice: Number(cur.unit_price), qty: newQty, isTaxFree: isFree });
+
+      // 출고완료(APPROVED) 상태에서 수량 변경 시 재고 ± 동기화 + stock_moves 이력
+      // ITEM 종류만 (택배/용차는 재고 미차감이라 skip — 위 cur.kind 검사로 ITEM 확정됨)
+      if (order.status === "APPROVED") {
+        const oldQty = Number(cur.qty);
+        const diff = newQty - oldQty;  // +면 추가 차감, -면 복원
+        if (diff !== 0) {
+          // 출고 시 사용된 창고 — momo_stock_moves 의 OUT ref_objid 매칭으로 lookup
+          const whRes = await client.query(
+            `SELECT wh_objid FROM momo_stock_moves
+              WHERE ref_type = 'ORDER' AND ref_objid = $1 AND item_objid = $2
+              ORDER BY regdate ASC LIMIT 1`,
+            [orderObjid, cur.item_objid]
+          );
+          if (whRes.rowCount && whRes.rows[0].wh_objid) {
+            const whObjid = whRes.rows[0].wh_objid;
+            await client.query(
+              `UPDATE momo_stocks SET qty = qty - $1, update_date = NOW()
+                WHERE wh_objid = $2 AND item_objid = $3`,
+              [diff, whObjid, cur.item_objid]
+            );
+            // 이력 — qty 부호: +이면 추가 출고(-diff), -이면 복원(+|diff|).
+            // move_type 은 OUT(-) / IN(+) 으로 표기, qty 컬럼은 부호 그대로.
+            const moveType = diff > 0 ? "OUT" : "IN";
+            const moveQty = -diff;  // OUT 이면 -, IN 이면 +
+            const moveObjid = String(Date.now()) + String(Math.floor(Math.random() * 10000));
+            await client.query(
+              `INSERT INTO momo_stock_moves
+                 (objid, wh_objid, item_objid, move_type, qty, ref_type, ref_objid, memo, regdate, regid)
+               VALUES ($1, $2, $3, $4, $5, 'ORDER', $6, $7, NOW(), $8)`,
+              [moveObjid, whObjid, cur.item_objid, moveType, moveQty, orderObjid,
+               `수량 수정: ${oldQty} → ${newQty}`, r.user.objid ?? r.user.userId]
+            );
+          }
+        }
+      }
+
       await client.query(
         `UPDATE momo_order_items SET
            qty = $2,