An absorbent article which includes a longitudinal direction, a width direction, and a thickness direction that are mutually orthogonal to each other, comprising: an absorbent main body; a pair of side flaps that extend to both outer sides in the width direction of the absorbent main body; and a pair of leakage barriers that are disposed in the absorbent main body, wherein a direction toward and a direction away from a longitudinal direction central axis of the absorbent main body in the width direction are respectively an inner side direction and an outer side direction, the absorbent article further comprising: an elastic member which is joined in between the pair of side flaps in the absorbent main body, and is stretchable and shrinkable in the width direction, wherein each of the pair of leakage barriers includes: a standing portion in which an outer side end in the width direction is a fixed end, and an inner side end in the width direction is a free end, and a supporting portion which is adjacent to one end portion in the longitudinal direction of the standing portion and overlaps with the elastic member in the thickness direction, the supporting portion includes: an inner side portion which is positioned on an inner side in the width direction and is not fixed to the absorbent main body, and an outer side portion which is positioned on an outer side in the width direction and is fixed to the absorbent main body by a heat welding portion, and the inner side portion covers at least a portion of the heat welding portion of the outer side portion in a state of being reversed toward the outer side in the width direction. an elastic member which is joined in between the pair of side flaps in the absorbent main body, and is stretchable and shrinkable in the width direction, wherein each of the pair of leakage barriers includes: a standing portion in which an outer side end in the width direction is a fixed end, and an inner side end in the width direction is a free end, and a supporting portion which is adjacent to one end portion in the longitudinal direction of the standing portion and overlaps with the elastic member in the thickness direction, a standing portion in which an outer side end in the width direction is a fixed end, and an inner side end in the width direction is a free end, and a supporting portion which is adjacent to one end portion in the longitudinal direction of the standing portion and overlaps with the elastic member in the thickness direction, the supporting portion includes: an inner side portion which is positioned on an inner side in the width direction and is not fixed to the absorbent main body, and an outer side portion which is positioned on an outer side in the width direction and is fixed to the absorbent main body by a heat welding portion, and an inner side portion which is positioned on an inner side in the width direction and is not fixed to the absorbent main body, and an outer side portion which is positioned on an outer side in the width direction and is fixed to the absorbent main body by a heat welding portion, and the inner side portion covers at least a portion of the heat welding portion of the outer side portion in a state of being reversed toward the outer side in the width direction.