MOTOR

[Problem] To improve heat dissipation properties of an amplifier unit. [Solution] This motor (1) is provided with: a motor unit (2) provided with a stator and a rotor; and an amplifier unit (4) provided with substrates (5a-5e) respectively disposed such that the surface direction is along the direction of the axis (AX) of the motor unit (2), and a main circuit unit (500) which uses at least one of the substrates (5a-5e), and which supplies power to the motor unit (2). Furthermore, the amplifier unit (4) is provided with a frame (6) for accommodating the substrates (5a-5e). The main circuit unit (500) is provided with the power substrate (5a) disposed in the vicinity of the inner surface of the frame (6). The amplifier unit (4) is provided with: switching elements (SW) which are disposed on the left surface (51) of the power substrate (5a), and which generate heat when a current is passed therethrough; and a thermally conductive sheet (9a) which is disposed between the power substrate (5a) and the inner surfac