To provide an animal litter box that is easy to clean and whose setup space is not large. An animal litter boxequipped with an excreta container; a lower container; and a hood, the hood has a fixed hood at a backside; a movable hood disposed at a front side; and a pair of linking portions. The movable hood is formed with an opening. When the movable hood is changed from a closed state to an opened state, the protruding height T3 that is the difference of the height T1 of the highest portion in the track of movement of the movable hood and the height T2 of the highest portion of the animal litter box when the movable hood is in a closed state is lower than the height T4 of the movable hood.