PURPOSE: To upgrade the surface accuracy and dimension accuracy of a product by disposing ball bearings between endless belts and pressurizing platens when a laminate material is clamped by the endless belt for heat pressurizing.

CONSTITUTION: An endless belt unit 2 consists of a couple of steel belts hung on rolls 1a and 1b in the state that tension is applied and the upper and lower belts driven by the equal speed. A laminate material 7 is clamped between a couple of said endless belts 2 and conveyed from the right to the left. Ball bearing bases 4 are disposed on the rear faces of respective endless belts 2 forming the inner sides of the endless belts, at the back of which pressurizing platens 3 are installed, and heating circuits (cooling circuits for cooling areas) are set on the pressurzing platens and heated (cooled) by a medium controlled at the desired temperature. A cylinder or cylinders 5 set to one or both of couple of pressurizing platens and pressurized by hydraulic pressure or the like to clamp the laminate material between the endless belts 2.