A tape-type disposable diaper comprising: a main body having a ventral side portion extending to a front side from a center in a front-back direction and a dorsal side portion extending to a back side from the center in the front-back direction; fastening tapes protruding from both side portions of a lower torso portion of the dorsal side portion; and a waist stretching sheet disposed in the lower torso portion of the dorsal side portion, wherein the main body includes an absorber, a liquid impervious sheet covering a back surface side of the absorber, an outer sheet covering a back surface side of the liquid impervious sheet, left and right side flap portions each located outside a side edge of the absorber, and a rising gather including: a gather sheet forming a root portion fixed to a region including each of the side flap portions, and a protruding portion extending from the root portion; a fallen portion in which both end portions of the protruding portion in a front-back direction are fixed in a fallen state; a non-fixed rising portion located between front and back fallen portions in the protruding portion; and a gather elastic member fixed in a state of being stretched in the front-back direction at least at a tip portion of the rising portion, each of the fastening tapes having a base portion attached to the lower torso portion of the dorsal side portion and a connecting portion detachably connected to an outer surface of the ventral side portion, the waist stretching sheet serving as a non-stretchable region at both end portions in the width direction and serving as a main body stretchable region that elastically expands and contracts in the width direction at a portion between the non-stretchable regions, wherein the non-stretchable region has a width in the range of 5-40 mm, the waist stretching sheet extends across the left and right side flap portions, and the main body has a fixed folded-back portion obtained by folding back a side including a portion of the waist stretching sheet in the non-stretchable region to a center side and fixing thereto, the fold position located within a range of ± 5 mm in the width direction from the boundary between the stretchable region and the non-stretchable region. a main body having a ventral side portion extending to a front side from a center in a front-back direction and a dorsal side portion extending to a back side from the center in the front-back direction; fastening tapes protruding from both side portions of a lower torso portion of the dorsal side portion; and a waist stretching sheet disposed in the lower torso portion of the dorsal side portion, wherein the main body includes an absorber, a liquid impervious sheet covering a back surface side of the absorber, an outer sheet covering a back surface side of the liquid impervious sheet, left and right side flap portions each located outside a side edge of the absorber, and a rising gather including: a gather sheet forming a root portion fixed to a region including each of the side flap portions, and a protruding portion extending from the root portion; a fallen portion in which both end portions of the protruding portion in a front-back direction are fixed in a fallen state; a non-fixed rising portion located between front and back fallen portions in the protruding portion; and a gather elastic member fixed in a state of being stretched in the front-back direction at least at a tip portion of the rising portion, each of the fastening tapes having a base portion attached to the lower torso portion of the dorsal side portion and a connecting portion detachably connected to an outer surface of the ventral side portion, the waist stretching sheet serving as a non-stretchable region at both end portions in the width direction and serving as a main body stretchable region that elastically expands and contracts in the width direction at a portion between the non-stretchable regions, wherein the non-stretchable region has a width in the range of 5-40 mm, the waist stretching sheet extends across the left and right side flap portions, and the main body has a fixed folded-back portion obtained by folding back a side including a portion of the waist stretching sheet in the non-stretchable region to a center side and fixing thereto, the fold position located within a range of ± 5 mm in the width direction from the boundary between the stretchable region and the non-stretchable region.