PROBLEM TO BE SOLVED: To provide a method for firmly fixing a skin to a molding tool, capable of preventing the skin from positional deviation and peeling.SOLUTION: In the method for fixing a skin to a molding tool, prior to forming a foam molded product including a foam molding and skin 31 to be integrally joined to one side of the foam molding in a pair of molding tools 50 and 60, the skin 31 is fixed to one molding tool 50 of the pair of molding tools 50 and 60. A holding mold 70 is fixed to the molding tool 50, and the skin 31 is held and fixed through cooperation of the molding tool 50 and the holding mold 70.