There is provided an absorbent article that improves the flexibility of the entire absorbent member, improves the diffusion of body fluid in use, and improves uniform absorptivity against the body fluid.A diaper of the device includes a topsheet, a backsheet, and an absorbent member oblong in longitudinal direction disposed between both the sheets. The absorbent member includes an absorbent core that contains an absorbent polymer and a covering member. The absorbent core includes a block region in which a plurality of block structures partitioned by longitudinal grooves and lateral grooves are disposed in a longitudinal direction (Y direction). Cavities are formed by the block structures of the absorbent core and the covering member covering the absorbent core. Portions, at which the cross-sectional areas of the cavities are maximum in a cross-sectional view of the plurality of longitudinal grooves taken along a vertical direction, are disposed at a crotch portion.本創作之尿布(1A)包含正面片材(2)、背面片材(3)及配置於該等兩片材(2、3)間之縱長之吸收體(4)。吸收體(4)包含含有吸收聚合物之吸收性芯體(41)及被覆材(42)。吸收性芯體(41)包含由縱槽(44Y)及橫槽(44X)劃分之塊狀構造(400)於縱向(Y方向)上配置有複數個之塊狀區域(411)。於尿布(1A),藉由吸收性芯體(41)之塊狀構造(400)與覆蓋吸收性芯體(41)之被覆材(42)而形成有空隙(5)。於垂直方向(T方向)橫剖面上剖面觀察複數個縱槽(44Y)時,空隙(5)之截面面積具有最大值之部位(5M)配置於胯襠部(C)。1A‧‧‧拋棄式尿布2‧‧‧正面片材3‧‧‧背面片材4‧‧‧吸收體6‧‧‧立體褶皺7‧‧‧緊固帶8‧‧‧著扣帶43‧‧‧凸部62‧‧‧立體褶皺形成用片材411‧‧‧塊狀區域412‧‧‧非塊狀區域
