Rotary reciprocating drive actuator

A rotary reciprocating drive actuator, comprising:

• a movable body including:
• a shaft part to which a movable object is connected at one end portion side of the shaft part, and
• a magnet fixed to the shaft part at an other end portion side of the shaft part, the movable body being supported to be capable of performing a reciprocating rotation about an axis;
• a core assembly including:
• a core body comprising a plurality of magnetic poles facing an outer circumference of the magnet to sandwich the magnet,
• a coil body that is wound around the core body and that is energized to generate a magnetic flux interacting with the magnet to cause the reciprocating rotation of the movable body, and
• a magnet position holding portion that generates a magnetic attraction force between the magnet position holding portion and the magnet to define a reference position of the reciprocating rotation;
• a top cover mounted on the core assembly from the other end side and comprising a concave sensor housing into which the shaft is inserted;
• and
• a sensor board on which a sensor for detecting a rotational angle of the shaft part is mounted on the top cover, the sensor board covering the concave sensor housing of the top cover and the core assembly from the other end portion side, with the sensor facing the magnet side.