To provide a disposable catch tray for a gas range grill, eliminating the need of washing after a gas range grill is used.

This gas range grill auxiliary implement includes: a catch tray made of aluminum foil having a peripheral wall placed on an accessory catch tray used in an arbitrary gas range grill; and a partition plate corrugated and made of aluminum foil so that the catch tray is filled with water to float an object to be grilled disposed in the catch tray and not to come into contact with the object to be cooked.