An absorbent article for pets includes a front surface layer, a back surface layer, and an absorbent body, and is formed in a rectangular shape having a first end portion, a second end portion, and a pair of side portions. The first end portion is arranged on the body of the pet, and the second end portion side is detachably attached to the outer surface of the first end portion when worn. The absorbent article further includes an engaging member arranged on the outer surface side of the first end portion, and is engageable with the inner surface of the second end portion. A part of the outer surface of the back surface layer is formed from a member engageable with the engaging member. A low rigidity area is formed towards the second end portion side of the section on the first end portion where the engaging member is arranged.
