To measure weight of excreta, and to suppress external leak of excreta, even if an excreta receiver vessel is not mounted.SOLUTION: A gravimeter (40) held by an animal toilet (1) includes a stand (42) pressed from an excreta receiver vessel (16), and a weight sensor (41) for outputting an electric signal corresponding to pressing force from the stand (42), in which the stand (42) has a recess (46) overlapped with an upper mesh (22) through the excreta receiver vessel (16).SELECTED DRAWING: Figure 3【課題】排泄物受け容器が非装着でも、排泄物の重量計測が可能で、かつ、排泄物の外部漏れを抑制する。【解決手段】ペット用トイレ（１）が有する重量計（４０）は、排泄物受け容器（１６）から押圧される台（４２）と、台（４２）からの押圧力に応じた電気信号を出力する重量センサ（４１）と含み、台（４２）は、排泄物受け容器（１６）を介して上方のメッシュ（２２）と重なる凹部（４６）を有する。【選択図】図３
