Abstract: A tape-type disposable diaper having upper and lower fastening tapes divided by a perforated line, wherein the initial point of the perforated line is noticeable. The diaper has a fastening tape extending widthwise from each of the opposed lateral portions of the dorsal region, wherein, assuming that a part of the side edge of each fastening tape located between the fastening parts of the waist-side flap and the round-leg-side flap is equally divided in the front-back direction into the first edge located closer to the waist, the second edge located closer to the round-leg area, and the third edge located therebetween, at least part of the third edge is provided with a notch dented proximally from the first and second edges. By noticing the notch, the user recognizes the perforated line extending proximally from the notch, and tears along the perforated line for wearing the diaper.