Provided is an absorbent article for a pet which may be installed by surrounding the body of the pet. Here, an absorbent body of the absorbent article according to the present invention may adequately cover the urinary organs of the pet in entirety. A belt-shaped absorbent article (1) for a pet comprises: a surface layer (2) having liquid permeability； a back side layer (3) without liquid permeability； and an absorbent body (4) disposed between the surface layer (2) and the back side layer (3). Also, the absorbent article may be installed by surrounding the body of the pet. The absorbent body (4) comprises: a belt-shaped absorbent main body (41) which extends from one end to the other end in a longer direction (LD) of the absorbent article (1) for a pet； and a first extending portion (42) which extends from one side edge of a central part of the longer direction of the absorbent main body (41) to an outer direction of a width direction.
