PROBLEM TO BE SOLVED: To provide a collapsible diaper changing table capable of easily adjusting a holding belt which extends inside the changing table.SOLUTION: A collapsible diaper changing table 10 includes: a base 11; a changing table body 13 which is provided so as to be freely rotatable to the base 11 through a rotating shaft 12; and a mat 15 which is placed on the changing table body 13. The mat 15 is positioned by retainers 20a, 20b which are provided on the changing table body 13. One retainer 20a includes a buckle receiver 21, a holding belt 22 is inserted into the other retainer 20b, and the buckle 23 is attached on a tip of the holding belt 22. The holding belt 22 extends to the underside of the changing table body 13. A window 18 for adjusting the holding belt 22 is formed on the changing table body 13.