A tape-type disposable diaper comprising:
- a ventral side part extending to a front side of a center in a front-back direction;
- a dorsal side part extending to a back side of the center in the front-back direction;
- a crotch portion extending from a middle of the ventral side part in the front-back direction to a middle of the dorsal side part in the front-back direction, the dorsal side part having wing parts extending to outer sides of the crotch portion in a width direction;
- an absorber incorporated in a range including the crotch portion;
- and
- connecting tapes attached to the wing parts of the dorsal side part and to be detachably connected to the ventral side part,
- each of the connecting tapes having a base portion fixed to one of the wing parts, a main unit section extending from the base portion, a connecting portion provided in a middle of the main unit section in the width direction and to be detachably connected to the ventral side part, and a non-connecting portion provided between the connecting portion and the base portion and to be not connected to the ventral side part,
- a lower edge of the main unit section having a shape in which a position of the lower edge shifts upward from a proximal end close to the base portion toward a distal end far from the base portion,
- a lower edge of the connecting portion coinciding with the lower edge of the main unit section from the proximal end close to the base portion to the distal end far from the base portion,
- wherein a lower edge of the non-connecting portion has a shape in which a tangent angle decreases without having a critical point and an inflection point from a distal end far from the base portion toward a proximal end close to the base portion,
- the lower edge of the non-connecting portion has a curved part at least in a part,
- a tangent angle of a distal end of the lower edge of the non-connecting portion is 80 to 85 degrees, and a tangent angle of a proximal end of the lower edge of the non-connecting portion is 0 degree, and
- when a shorter one of a distance in the width direction between the proximal end of the lower edge of the non-connecting portion and the distal end of the lower edge of the non-connecting portion and a distance in the front-back direction between the proximal end of the lower edge of the non-connecting portion and the distal end of the lower edge of the non-connecting portion is set to r, the entire lower edge of the non-connecting portion exclusively includes a part having a radius of curvature of 0.8r or more.