A longitudinal groove 51 longitudinally extending in a rear region C and an inner groove 61 located laterally inside of the longitudinal groove 51 in the rear region C are formed in a skin-facing surface of the absorbent assembly 5. The longitudinal groove 51 is broken on the way in a longitudinal direction X, and the broken portions 52A, 52B are present within a specific region CS in the rear region which is located between two imaginary straight lines extending in the lateral direction Y through longitudinal front and rear ends 9a, 9b of a rear adhesive portion 9 formed on a non-skin-facing surface of the rear flap portion 8, and an inner groove 61 is present within the specific region CS.於吸收性本體5之肌膚對向面形成有:縱槽51,其沿著縱向延伸於後方部C;及內側槽61,其於後方部C位於較縱槽51靠橫向Y之內側的位置。縱槽51於縱向X中斷,該中斷部52A、52B存在於由2條假想直線L1、L2夾持之後方部特定區域CS內,且內側槽61存在於後方部特定區域CS內,該2條假想直線L1、L2係分別通過形成於後方翼部8之非肌膚對向面的後方黏著部9之縱向前後端9a、9b且沿著橫向Y延伸。1‧‧‧衛生棉2‧‧‧正面片材4‧‧‧吸收體5‧‧‧吸收性本體6‧‧‧側翼部7‧‧‧側翼部8‧‧‧後方翼部8a‧‧‧縱向前端9‧‧‧後方黏著部9a、9b‧‧‧前後端10‧‧‧側片材11‧‧‧第1接合線12‧‧‧第2接合線15‧‧‧交界40‧‧‧主吸收體41‧‧‧輔助吸收體42‧‧‧中高部51‧‧‧縱槽52A、52B‧‧‧中斷部53‧‧‧分斷區域61‧‧‧內側槽61a‧‧‧前端61b‧‧‧後端71、72‧‧‧橫槽A‧‧‧前方部B‧‧‧排泄部對向部C‧‧‧後方部CS‧‧‧後方部特定區域L1、L2‧‧‧假想直線T1‧‧‧後方黏著部9之縱向X之長度T2‧‧‧後方翼部8之縱向X之長度T3‧‧‧自排泄部對向部B與後方部C之交界15(後方翼部8之縱向前端8a)至後方黏著部9之縱向前端9a為止之長度X‧‧‧縱向Y‧‧‧橫向
