An absorbent article comprising: an absorbent body provided between a liquid permeable topsheet and a backsheet; a concave groove formed in a surface of the absorbent body on the liquid permeable topsheet side and extending along an approximately longitudinal direction of the groove;and a highly compressed portion formed in a bottom surface of the concave groove, wherein the highly compressed portion includes a slanted element extending in a width direction of the concave groove and sloping in a longitudinal direction thereof so as to cross the concave groove from one side edge to the other side edge, in a unit portion hypothetically formed by dividing the concave groove in a longitudinal direction thereof, the slanted element being formed into a pattern including a regular arrangement in which the highly compressed portion is formed in the unit portion and a reversed arrangement in which the regular arrangement is reversed in the longitudinal direction that are alternately arranged along the longitudinal direction of the groove; wherein the absorbent body has an absorbent body concave portion formed in the surface on the liquid permeable topsheet along a longitudinal direction of the absorbent article across a range of the longitudinal direction including a body fluid expelling area, and an embossed part including the highly compressed portion is formed along the absorbent body concave portion. wherein the embossed part is provided so as to have a width wider than a width of the absorbent body concave portion, and high-density areas obtained by compressing the absorbent body are formed on both sides of the absorbent body concave portion by providing the embossed part. an absorbent body provided between a liquid permeable topsheet and a backsheet; a concave groove formed in a surface of the absorbent body on the liquid permeable topsheet side and extending along an approximately longitudinal direction of the groove;and a highly compressed portion formed in a bottom surface of the concave groove, wherein the highly compressed portion includes a slanted element extending in a width direction of the concave groove and sloping in a longitudinal direction thereof so as to cross the concave groove from one side edge to the other side edge, in a unit portion hypothetically formed by dividing the concave groove in a longitudinal direction thereof, the slanted element being formed into a pattern including a regular arrangement in which the highly compressed portion is formed in the unit portion and a reversed arrangement in which the regular arrangement is reversed in the longitudinal direction that are alternately arranged along the longitudinal direction of the groove; wherein the absorbent body has an absorbent body concave portion formed in the surface on the liquid permeable topsheet along a longitudinal direction of the absorbent article across a range of the longitudinal direction including a body fluid expelling area, and an embossed part including the highly compressed portion is formed along the absorbent body concave portion. wherein the embossed part is provided so as to have a width wider than a width of the absorbent body concave portion, and high-density areas obtained by compressing the absorbent body are formed on both sides of the absorbent body concave portion by providing the embossed part.