There is provided an absorbent article that improves absorptivity against body fluid in use, improves the flexibility of the entire absorbent member, and improves a shape retaining property of an absorbent member having absorbed body fluid.A diaper of the invention includes a topsheet, a backsheet, and a vertically-long absorbent member disposed between both the sheets. The absorbent member includes an absorbent core that is constricted at a crotch portion. The absorbent core includes a block region in which a plurality of block structures including protruding portions having a high basis weight and groove portions having a low basis weight are disposed in a longitudinal direction from a front portion over a rear portion, and a non-block region that surrounds the outer periphery of the block region. The block region is formed so that the width of each of the front portion and the rear portion is larger than the width of the crotch portion. The front portion of the block region extends toward the crotch portion beyond a position where the width of the front portion of the absorbent core starts to be reduced.本創作之尿布(1)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)包含胯襠部(C)變細之吸收性芯體(41)。吸收性芯體(41)包含含有基重較高之凸部(43)及基重較低之槽部(44)之塊狀構造(400)自腹側部(A)起遍及背側部(B)於縱向上配置有複數個的塊狀區域(411)、及包圍塊狀區域(411)之外周之非塊狀區域(412)。塊狀區域(411)形成為腹側部及背側部之寬度大於胯襠部之寬度。塊狀區域(411)之腹側部(411a)越過吸收性芯體(41)之腹側部(A)之寬度開始變窄之位置(Ka1)而向胯襠部(C)側延伸。1‧‧‧拋棄式尿布2‧‧‧正面片材3‧‧‧背面片材4‧‧‧吸收體7‧‧‧緊固帶8‧‧‧著扣帶9‧‧‧空間9X‧‧‧空間9Y‧‧‧空間41‧‧‧吸收性芯體42‧‧‧被覆材43‧‧‧凸部44‧‧‧槽部44X‧‧‧橫槽44Y‧‧‧縱槽62‧‧‧立體褶皺形成用片材63‧‧‧腿彈性構件64‧‧‧腰部彈性構件400‧‧‧塊狀構造411‧‧‧塊狀區域412‧‧‧非塊狀區域A‧‧‧腹側部B‧‧‧背側部C‧‧‧胯襠部CL‧‧‧中心線X‧‧‧方向Y‧‧‧方向
