An absorbent article (10) having a liquid-permeable surface sheet (14), a liquid-impermeable reverse surface sheet (12), and an absorbent body (13) which is disposed between the surface sheet (14) and the reverse surface sheet (12). The absorbent article (10) includes: groove sections (21), the entirety or one portion of said groove sections (21) comprising recessed sections (21r) formed at the surface sheet (14) side of the absorbent article (10) by integrally joining the surface sheet (14) and the absorbent body (13) and flat sections (24a) that are surrounded by the groove sections (21). The diameter (R1) of the maximum inscribed circles of the flat sections (24a) is 5-20 times the width (L1) of the groove sections (21) along the radial direction of the maximum inscribed circle.本發明之吸收性物品(10)係包含透液性之正面片材(14)、不透液性之背面片材(12)、及配置於上述正面片材(14)與上述背面片材(12)之間之吸收體(13)者,且包含:槽部(21),其係以凹部(21r)構成整體或一部分者,且上述凹部(21r)係於上述吸收性物品(10)之上述正面片材(14)側,將上述正面片材(14)與上述吸收體(13)一體地接合而形成;及平坦部(24a),其係被上述槽部(21)包圍;且相對於上述平坦部(24a)之最大內接圓之直徑(R1)係為沿上述最大內接圓之徑方向之上述槽部(21)之寬度(L1)之5倍以上20倍以下。13‧‧‧吸收體13A‧‧‧缺口部21‧‧‧槽部21a‧‧‧第1凹部21b‧‧‧第2凹部21r‧‧‧凹部24‧‧‧平坦部24a‧‧‧第1平坦部24b‧‧‧第2平坦部M1‧‧‧前身部分M2‧‧‧胯下部分M3‧‧‧後身部分N1‧‧‧凹部形成區域N2‧‧‧凹部非形成區域P‧‧‧假想線Q‧‧‧範圍R1‧‧‧直徑V-V‧‧‧方向α‧‧‧角度β‧‧‧角度
