The present invention provides a single-side opening paper diaper that is easily placing the position of absorptive body in the middle position of the body while wearing and may have excellent fitness. The absorptive article includes: a longitudinal direction, a transverse direction crossing the longitudinal direction, and a front-back direction crossing the longitudinal direction and the transverse direction, and comprises: a front waist portion along the transverse direction, a rear waist portion along the transverse direction, and an absorptive body having the absorptive liquid, wherein the absorptive article has the absorptive body disposed between the front waist portion and the rear waist portion. The present invention is characterized in: the end on one side of the rear waist portion in the transverse direction and the end on one side of the front waist portion in the transverse direction are joined by a first joining portion； a locking portion is disposed on the other side of the rear waist portion in the transverse direction to be locked with the front waist portion while wearing； at least one portion of a first region of the absorptive body nearer the one side than the middle position on the transverse direction is configured with an elastic region capable of extending or retracting along the transverse direction, but there is no elastic region configured in a second region of the absorptive body nearer the other side than the middle position on the transverse direction that is nearer than the edge of the other side of the absorptive body.本發明是在於提供一種於穿著時，易於使吸收體的位置合於身體的中央位置，具有良好的合貼性之單側開紙尿褲。解決手段：一種吸收性物品，係具有：縱向方向、及與上述縱向方向交叉之橫向方向、以及與上述縱向方向和上述橫向方向交叉之前後方向，並具備有：沿著上述橫向方向之前腰圍部、及沿著上述橫向方向之後腰圍部、以及具有吸收液體之吸收體，且設置於上述前腰圍部與上述後腰圍部之間的吸收性本體的吸收性物品，其特徵為：於上述橫向方向上之上述後腰圍部的一方側的端部，和於上述橫向方向上之上述前腰圍部的一方側的端部，是藉由第1接合部所接合；於上述橫向方向上之上述後腰圍部的另一方側，設置有於穿著時可卡止於上述前腰圍部的卡止部；於上述前腰圍部，在比上述吸收性本體之位於上述橫向方向上之中央位置更靠近上述一方側的第1區域中之至少一部分，設置有朝上述橫向方向伸縮之彈性區域，在比上述吸收性本體之位於上述橫向方向上之中央位置更靠近上述另一方側的第2區域之中，比上述吸收性本體的上述另一方側
