Provided is a litter box for animals that is hygienic and easy to clean. A litter box (1) for animals is provided with a lower container (30), the upper part of which is open and which has a lower bottom surface part (31) and a lower side wall part (32) standing up from the peripheral edge of the lower bottom surface part (31), and an upper container (20), the upper part of which is open and which is disposed above the lower container (30). The upper container (20) is provided with a upper bottom surface part (21) in which a plurality of through holes (211) is formed, an upper wall part (22) standing up from the peripheral edge of the upper bottom surface part (21), and an extending wall part (23) that extends downward from the outer surface of the upper wall part (22). The lower end part of the extending wall part (23) is disposed lower than the upper bottom surface part (21).
