To provide a molding tool for bonding a label to a product at the same time so as to prevent the peeling of the label.

The molding tool is constituted of an outer mold tool 1 having a hollow part 11 capable of housing an inner mold tool 2 and the inner mold tool 2 having a hollow part 23 in which the label 4 is inserted. A raw material 3 is put in the outer mold tool 1 and the inner mold tool 2 is pushed in the hollow part 11 of the outer mold tool 1. The raw material 3 is expanded into the shapes of the hollow parts 11 and 23 by blowing air in the raw material 3 to become a plastic product and the label 4 is integrally bonded to the plastic product.