diff --git a/sql.go b/sql.go
index 2395de6..df6abb9 100644
--- a/sql.go
+++ b/sql.go
@@ -182,6 +182,12 @@ func initDB() {
 							,status			  VARCHAR(32)
 							,end			  DATETIME NOT NULL
 							,FOREIGN KEY (obj_id) REFERENCES obj(id) ON DELETE CASCADE
+							,FOREIGN KEY (seller_id) REFERENCES obj_user(obj_id) ON DELETE CASCADE
+							,FOREIGN KEY (buyer_id) REFERENCES obj_user(obj_id) ON DELETE CASCADE
+							,FOREIGN KEY (seller_guild_id) REFERENCES obj_guild(obj_id) ON DELETE CASCADE
+							,FOREIGN KEY (buyer_guild_id) REFERENCES obj_guild(obj_id) ON DELETE CASCADE
+							,FOREIGN KEY (seller_castle_id) REFERENCES obj_castle(obj_id) ON DELETE CASCADE
+							,FOREIGN KEY (buyer_castle_id) REFERENCES obj_castle(obj_id) ON DELETE CASCADE
 							,KEY (lot_id)
 						  ) ENGINE = InnoDB CHARSET=utf8mb4 COLLATE utf8mb4_unicode_ci;`)
 	failOnError(err, "initDB : create table obj_msg_auction_announce")