The Key to Room 1 (Japanese: １ごうしつのカギ Room No. 1 Key), known as the Rm. 1 Key in Generation III, is a Key Item introduced in Generation III.
The Key to Room 1 unlocks the door to Room 1 inside the Abandoned ShipRSE/Sea MauvilleORAS, and is part of the puzzle to obtain the ScannerRSE/Storage KeyORAS. It breaks upon using it, consuming the item.