To provide a disposable diaper for pets having an excellent fit around the waist of the pet. A disposable diaper for pets, having: a rear-side waist area (130)； a stomach-side waist area (110)； a crotch area (120)； an inside surface (100Z1)； an outside surface (100Z2)； an absorbent core (200)； an area (200) not having the absorbent core arranged therein； an attachment section (300) provided in the stomach-side waist area (110) and having a prescribed length； a hook section provided in the attachment section (300)； and an attachment area (900) provided on the outside surface (100Z2) of the rear-side waist area (130) and which receives the hook section of the attachment section (300). The attachment area (900) comprises a non-woven first attachment area (900A) arranged on the outside surface (100Z2) of a diaper main body section (140B) in an area (170) not having the absorbent core arranged therein, in at least the rear-side waist area (130).
