An animal litter box is to be provided that can be cleaned easily and can reduce the number of time to change an animal litter , particularly an animal litter box that allows liquid such as urine evacuated onto the granular materials to move to a liquid-absorbing sheet efficiently. An animal litter box includes a granular material container having an opening for an animal going in and out, and a liquid penetrating bottom part on which granular materials are dispersed; and a liquid-absorbing sheet holder placed under the bottom part of the granular material container on which a liquid-absorbing sheet is placed, wherein the bottom part of the granularmaterial container has a liquid leading part formed by connected arches on a side facing the liquid-absorbing sheet.