Abstract: A pants-type disposable diaper 1 including a diaper main body 2 having a front abdomen portion P, a back portion Q, and leg hole sections S which are formed on both sides of a crotch portion R between these portions, and further having a waist opening which is formed by joining each of both side edges of the front abdomen portion to corresponding each one of both side edges of the back portion, with the crotch portion being provided with an absorbent main body 3, in which waist elastic members 6 are attached in an expanded state in a diaper width direction to parts of the front abdomen portion and to parts of the back portion, both of which parts are corresponding to the waist opening, with each of the leg hole sections being provided with a leg-hole elastic member 8 which is attached in an expanded state along the leg hole, wherein the diaper main body 2 is provided with a display part 20 which displays identification information including a size and a front or back side of the diaper main body, and the like