Provided is a litter box for animals in which a suitable amount of excretion treating agent can be determined visually. A litter box (1) for animals is provided with a granule accommodating container (2) that accommodates a plurality of granules (5). The granule accommodating container (2) is provided with: a container main body (20), which has a lower surface part (21) and a side wall part (22) standing up from the peripheral edge (23) of the lower surface part (21); and a protruding part (40), which has a protruding part lower surface (41), which sticks out toward the outside from the side wall part (22) on the container main body (20) and is curved at a prescribed angle with respect to the side wall part (22), and a protruding part side wall (42). The lower end part of the protruding part lower surface (41) is positioned above the upper end part of the lower surface part (21).