An object of the present invention is to provide an easy deployment type disposable diaper along the body of the child to take the attitude of when was in the womb. And which has a longitudinal direction and a width direction intersecting A one another, from one side in the longitudinal direction, the first waist portion, crotch portion, and a second waist portion is arranged to be disposable diaper deployment type, absorption and body core, and a pair of fastening tape extending from the first waist portion on both outer sides in the width direction, the second waist portion, when it is aligned in the longitudinal direction of the ends of the disposable diaper, longitudinal fastening tape the longitudinal position of the edge in the direction of the crotch portion is located, has an engagement end of the fastening tape, absorbent core, both ends in the width direction having at least a pair of cutout portions, in the longitudinal direction , a product center is the center of the disposable diaper, in the region between the locking end, in the region between the center and the locking edge of the area, part of the absorbent core that is sandwiched between a pair of cutout portions sites of greatest width decreases of the is located.BACKGROUND 4【課題】胎内に居た時の姿勢を取る児の体に沿い易い展開型の使い捨ておむつを提供すること。【解決手段】互いに交差する長手方向及び幅方向を有するとともに、長手方向の一方側から、第1胴回り部、股下部、及び、第2胴回り部が並ぶ、展開型の使い捨ておむつであって、吸収体コアと、第1胴回り部から幅方向の両外側に延出する一対のファスニングテープとを有し、第2胴回り部は、使い捨ておむつの長手方向の両端を揃えた際に、ファスニングテープの長手方向の股下部側の端が位置する長手方向の位置に、ファスニングテープの係止端を有し、吸収体コアは、幅方向の両端に、少なくとも一対の切欠き部を有し、長手方向において、使い捨ておむつの中心である製品中心と、係止端との間の領域のうち、当該領域の中心と係止端との間の領域に、一対の切欠き部に挟まれる吸収体コアの部位のうち最も幅が狭くなる部位が位置している。【選択図】図4
