PROBLEM TO BE SOLVED: To provide a tape type disposable diaper having high peel strength of a connection tape, and excellent in fitting property.SOLUTION: In a tape type disposable diaper, a connection tape 13 has a base end part 13C fixed to a wing part WF, and an extension part 13B extending from the base end part 13C to a width direction outer side. A shape of the extension part 13B of the connection tape 13 forms a shape in which a length in a longitudinal direction is narrowed in a step form from a base end side toward a tip side. A length in the longitudinal direction in a width direction intermediate part of the extension part 13B is 15 mm-45 mm, a length in the longitudinal direction in the width direction intermediate part of the extension part 13B is the same length in any point in the width direction, or is different in any point in the width direction, a difference between a longest part and a shortest part lies in a range of 2.0 mm, and at least the width direction intermediate part of the connection tape 13 is provided with a connection part 13A for fixing the connection tape 13 to the outside surface of a belly side part.SELECTED DRAWING: Figure 7COPYRIGHT: (C)2020,JPO&INPIT【課題】連結テープの剥離強度が高く、フィット性に優れるテープタイプ使い捨ておむつを提供すること。【解決手段】連結テープ13は、ウイング部WFに固定される基端部13Cと、基端部13Cから幅方向外方へ向って延在する延在部13Bとを有し、連結テープ13の延在部13Bの形状は、基端側から先端側へ向かって、階段式に、前後方向の長さが狭まる形状を成し、前記延在部13Bの幅方向中間部における前後方向の長さは、15mm~45mmであり、前記延在部13Bの幅方向中間部における前後方向の長さは、幅方向のいずれの地点においても同じ長さであり、または、幅方向のいずれかの地点によって長さが異なり、最長部分と最短部分の差が2.0mmの範囲内であり、少なくとも前記連結テープ13の幅方向中間部に、前記連結テープ13を前記腹側部分の外面に固定する連結部13Aが設けられている。【選択図】図7