To provide a manufacturing device for a thermoplastic endless belt capable of heating and pressurizing a belt base material at a substantially uniform temperature, and a manufacturing method for the thermoplastic endless belt.

This manufacturing device 1 for the thermoplastic endless belt is for use in the endless belt with both ends of the thermoplastic belt base material matched as to a belt longitudinal direction. The manufacturing device 1 for the thermoplastic endless belt is provided with a pair of hot panels 2 arranged oppositely to heat the matched part 23A of the belt base material 20A, cooling parts 4, 5 for cooling belt both ends of the matched part 23A in the longitudinal direction, and a pair of metal molds 3 arranged to contact with a pair of opposed faces 10, 11 of the paired hot panels 2 to clamp and to press the matched part 23A while heating the matched part 23A. The pair of metal molds 3 do not contact with the cooling parts 4, 5.