PROBLEM TO BE SOLVED: To provide a disposable diaper capable of being properly fitted to the crotch part.SOLUTION: The disposable diaper includes an upper absorber 50 and a lower absorber 51 movable in the width direction of the diaper and operation members 21, 22, 31 and 32 having the connection part 21g, 22g, 31g and 32g connected to the respective upper and lower absorbers 50 and 51 and outwardly protruding knob parts and is constituted so that the total width of the upper and lower absorbers 50 and 51 in the crotch part is expanded and contracted by pinching the operation members 21, 22, 31 and 32 to pull them.