An absorbent article for pet includes: a top sheet a back surface layer an absorbent core a first end portion and a second end portion opposing to each other in alongitudinal direction a first side portion and a second side portion opposing to each other in a width direction an engaging member disposed in the vicinity of the first end portion along the width direction of the absorbent article a first engaged portion engageable with the engaging member and is disposed in the vicinity of the second end portion, at least at a position faceable a central portion of the engaging member and a second engaged portion engageable with the engaging member with an engagement force smaller than an engagement force of the first engaged portion with the engaging member, and is disposed at least at a position faceable one of opposite ends of the engaging member.
