diff --git a/backend-node/src/controllers/popProductionController.ts b/backend-node/src/controllers/popProductionController.ts
index 61d81716..e118921b 100644
--- a/backend-node/src/controllers/popProductionController.ts
+++ b/backend-node/src/controllers/popProductionController.ts
@@ -2813,13 +2813,27 @@ export const getBomMaterials = async (req: AuthenticatedRequest, res: Response)
     );
     const baseQty = parseFloat(bomBase.rows[0]?.base_qty || "1") || 1;
 
+    // 기존 투입량 조회 (child_item_id별 합산)
+    const inputResult = await pool.query(
+      `SELECT detail_content as child_item_id, SUM(CAST(NULLIF(result_value, '') AS numeric)) as total_input
+       FROM process_work_result
+       WHERE work_order_process_id = $1 AND company_code = $2 AND detail_type = 'material_input'
+       GROUP BY detail_content`,
+      [processId, companyCode]
+    );
+    const inputMap = new Map<string, number>();
+    for (const row of inputResult.rows) {
+      inputMap.set(String(row.child_item_id), parseFloat(row.total_input) || 0);
+    }
+
     const materials = bomResult.rows.map((bd: Record<string, unknown>) => {
       const bomQty = parseFloat(String(bd.quantity || "0")) || 0;
       const lossRate = parseFloat(String(bd.loss_rate || "0")) || 0;
       const requiredQty = Math.ceil((processQty / baseQty) * bomQty * (1 + lossRate / 100));
+      const childItemId = String(bd.child_item_id || "");
       return {
         id: bd.id,
-        child_item_id: bd.child_item_id,
+        child_item_id: childItemId,
         child_item_code: bd.child_item_code || "",
         child_item_name: bd.child_item_name || "",
         bom_qty: bomQty,
@@ -2827,7 +2841,7 @@ export const getBomMaterials = async (req: AuthenticatedRequest, res: Response)
         process_type: bd.process_type || "",
         loss_rate: lossRate,
         required_qty: requiredQty,
-        input_qty: 0,
+        input_qty: inputMap.get(childItemId) || 0,
       };
     });