An absorbent article includes an absorbent body that includes an absorber and a pair of side flaps that extend outward from both ends of the absorbent body in a width direction. The absorbent article has a dorsal side and an abdominal side in a longitudinal direction. The pair of side flaps is disposed on the dorsal side of the absorbent body. Each of the pair of side flaps includes an engaging member. Each of the pair of side flaps is joined to the absorbent article further toward a skin side in the thickness direction than the absorbent body. The engaging member includes a first edge of the abdominal side and a second edge of the dorsal side. In the longitudinal direction, a dorsal side end of the absorber is disposed further toward the dorsal side than a first imaginary line that connects the first edges.
