An animal litter box (100) includes: a litter-box main portion (1) including an upper container (10) and a lower container (30)； an output main portion (60) including an output portion (61)； and a position regulator. The upper container (10) includes a plurality of holes (h) passing through the upper container in the up-down direction, and the lower container (30) includes a reception portion (32) that receives excrement that has passed through the plurality of holes (h). The output portion (61) includes: a top surface (61a) that comes into contact with the litter-box main portion (1)； and a side wall (61b) extending from an edge of the top surface (61a) in the up-down direction. The output portion (61) outputs a signal in accordance with a magnitude of a force that acts on the top surface (61a). The position regulator includes: a litter-box-side regulating portion (26) disposed on the litter-box main portion (1)； and an output-side regulating portion (62) disposed on the output main portion (60). The output-side regulating portion (62) is a portion different from the side wall (61b). The position regulator regulates a relative position between the litter-box main portion (1) and the output main portion (60) in at least one of the front-back direction and the left-right direction.
