PURPOSE: To obtain extremely high output by means of a small prime mover by connecting the input side to the output side with a mechanical torque multi plier in the mechanical torque amplifier used for a generator.

CONSTITUTION: An input prime mover 15 is connected to an output generator 16 with a first step mechanical torque multiplier 17 through a third step mechanical torque amplifier 19. Each mechanical torque multiplier 17 through 19 in the respective steps is made up, as shown in the figure, of main shafts 1 through 6 which are rotated while being interlocked with the rotation of an input shaft 3, connecting arms 7 and 11, a link 10, a parallel arm 9, and of an output arm 8 and the like, and the input of the input prime mover 15 is constituted to be amplified by, for example, 100 times.