MOTOR UNIT FOR WAVE GEAR SPEED REDUCER

In order to achieve a configuration for a motor unit for a wave gear speed reducer wherein the motor unit can be attached to the wave gear speed reducer in a compact manner, this motor unit 3 for a wave gear speed reducer is equipped with: a rotary shaft 52 extending in the axial line direction; a rotor unit 3a that rotates integrally with the rotary shaft 52; a stator unit 3b arranged opposing the rotor unit 3a; and a motor casing 51 to which the stator unit 3b is secured. The motor casing 51 has a second cover 62 that covers the rotor unit 3a and the stator unit 3b from the other side in theaxial line direction. The rotary shaft 52 extends toward the other side in the axial line direction, penetrates the second cover 62, and is connected to a cam 12. The second cover 62 has a support part 64 that extends toward the other side in the axial line direction, supports the rotary shaft 52 in a rotatable manner, and is positioned on the inside of an external gear 14 when a wave gear speedreducer 2 is attached to t