This diaper (1) is provided with a front sheet (2), a back sheet (3), and an oblong absorber (4) disposed between the two sheets (2, 3), and is provided with a liquid-permeable interlayer sheet (5) disposed between the absorber (4) and the front sheet (2). The absorber (4) has an absorbent core (41). The absorbent core (41) has a block region (411) in which a plurality of block structures (400) comprising convexities (43) of high basis weight and grooves (44) of low basis weight are disposed in the longitudinal direction spanning from a ventral section (A) to a dorsal section (B). The convexities (43) and grooves (44) of the absorbent core (41) are integrally molded, and the interlayer sheet (5) partially covers the block regions of the absorbent core, the interlayer sheet being shorter in the longitudinal direction (Y-direction) than are the block regions (411) of the absorbent core (41). The interlayer sheet (5) is disposed deviated to the ventral section (A) side of the absorbent core (41).本發明之尿布(1)包括正面片材(2)、背面片材(3)、配置於該等兩片材(2、3)間之縱長之吸收體(4)，於吸收體(4)與正面片材(2)之間包括液體透過性之中間片材(5)。吸收體(4)具有吸收性芯體(41)。吸收性芯體(41)具有塊狀區域(411)，該塊狀區域(411)中，自腹側部(A)跨及背側部(B)地沿縱方向配置有複數個包括基重較高之凸部(43)及基重較低之槽部(44)的塊狀構造(400)。吸收性芯體(41)之凸部(43)與槽部(44)成形為一體，中間片材(5)覆蓋上述吸收性芯體之上述塊狀區域之一部分，該中間片材之縱方向(Y方向)之長度短於吸收性芯體(41)之塊狀區域(411)之縱方向(Y方向)之長度。中間片材(5)係偏向於吸收性芯體(41)之腹側部(A)側而配置。
