A disposable pants-type diaper of the present invention comprises a diaper main body including a front portion, a back portion, and a crotch portion positioned therebetween, and having a waist opening and a pair of leg openings formed by joining the front portion and the back portion; an absorbent core disposed in the crotch portion; a first elastic means disposed along an upper part of an edge of the both leg openings; and a second elastic means disposed in a middle part in a front-back direction of the crotch portion, extending in a diaper width direction to near the edge of the both leg openings, and having straight side edge portions. According to the disposable pants-type diaper of the above, a foot is hardly caught by the edge of the leg opening in wearing, resulting in easily wearing; and a fitting property of the crotch portion is excellent.