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 at an other end portion side of the shaft part, the movable body being configured to perform a reciprocating rotation about an axis;
• a base portion including a pair of wall portions that are disposed to sandwich the movable object and support the shaft part via a bearing at the one end portion side such that the shaft part is rotatable;
• a core assembly including:
• a core body including 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 a 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, the core assembly being attached to a first wall portion of the pair of wall portions;
• and
• a sensor board that is attached to a second wall portion of the pair of wall portions and on which a sensor configured to detect a rotational angle of the shaft part is mounted, wherein;
• the outer surface of the second wall portion is provided with a concave sensor placement portion through which the one end portion of the shaft part is inserted and which opens to the outside, and
• the sensor board is positioned within the sensor placement portion so as to face the sensor toward the second wall portion and to close the sensor placement portion.