A keeping case provided with an upward-opening lower receiving base having a peripheral wall, a downward-opening small animal container disposed on the lower receiving base, and an upward-opening waste-receiving tray stored in the lower receiving base as to be drawn out. An inner brim portion along the peripheral wall is protruding from a middle position in vertical direction of the peripheral wall. An opening upper edge of the waste-receiving tray is hidden by the inner brim portion in a top view.