This absorbent article (1) for pets is provided with an absorbent body (10) for absorbing a liquid, and has a device holding part (100) for detachably holding a device (200) comprising a detection unit for detecting information during the wearing of the absorbent article (1). An area where the absorbent body (10) is disposed and an area where the device holding part (100) is disposed do not overlap in the direction of the thickness of the absorbent article (1).