To increase torque transmission capacity while suppressing upsizing of the frame of a power transmission device.
By setting the length in the rotation axis direction of the opposite parts of a third rotor 18 and a first rotor 28 longer than the length in the rotation axis direction of the opposite parts of the third rotor 18 and a first stator 16, torque which operates between the first rotor 28 and the third rotor 18 can be increased. By arranging a second stator 66 and a second rotor 78 outside in the radial direction of the third rotor 18 and increasing a radius of the opposite parts of the second stator 66 and the second rotor 78, torque which operates between the second stator 66 and the second rotor 78 can be increased while suppressing an increase of the length in the rotation axis direction of a rotating electric machine 10.
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