An electromechanical device includes: a center shaft; a rotor having a rotor magnet disposed around an outer periphery of the center shaft; and a stator disposed on an outer periphery of the rotor, wherein the center shaft is formed of a carbon-fiber-reinforced plastic, and when projection is performed in a radial direction from the center shaft toward the rotor magnet, an angle between a direction of carbon fiber in the carbon-fiber-reinforced plastic and a direction of the center shaft is 45°.