A rotary reciprocating drive actuator , comprising: a movable part including a rotating shaft on which a movable object is disposed; a fixed part configured to support the rotating shaft ; and a driving part configured to rotate the rotating shaft about an axis of the rotating shaft with respect to the fixed part by utilizing electromagnetic interaction, the driving part including a coil and a core each disposed on the fixed part , and a magnet disposed on the rotating shaft , wherein the magnet is a ring-shaped magnet such that an S pole and an N pole are alternately disposed on an outer peripheral surface of the magnet in a circumferential direction of the magnet , the core includes magnetic pole parts that are excited to generate a polarity by energizing the coil , and the core is disposed in such a way that the magnetic pole parts face the outer peripheral surface of the magnet via an air gap (G) when the rotating shaft is attached to the fixed part , and the number of magnetic poles of the magnet is equal to the number of the magnetic pole parts , and wherein the rotary reciprocating drive actuator further includes a rotation angle position holding part configured to hold a rotation angle position of the rotation shaft at a neutral position by a magnetic attraction force generated between the magnet and the rotation angle position holding part , the rotation angle position holding part being disposed on the fixed part so as to face the magnet via the air gap (G), and characterized in that the fixed part includes a first support and a second support disposed so as to face each other with the magnet therebetween in a direction of the axis, the rotating shaft is rotatably attached to the first support via the first bearing and to the second support via the second bearing , and one of the first bearing or the second bearing is a rolling bearing, and the other of the first bearing or the second bearing is a slide bearing. a movable part including a rotating shaft on which a movable object is disposed; a fixed part configured to support the rotating shaft ; and a driving part configured to rotate the rotating shaft about an axis of the rotating shaft with respect to the fixed part by utilizing electromagnetic interaction, the driving part including a coil and a core each disposed on the fixed part , and a magnet disposed on the rotating shaft , wherein the magnet is a ring-shaped magnet such that an S pole and an N pole are alternately disposed on an outer peripheral surface of the magnet in a circumferential direction of the magnet , the core includes magnetic pole parts that are excited to generate a polarity by energizing the coil , and the core is disposed in such a way that the magnetic pole parts face the outer peripheral surface of the magnet via an air gap (G) when the rotating shaft is attached to the fixed part , and the number of magnetic poles of the magnet is equal to the number of the magnetic pole parts , and wherein the rotary reciprocating drive actuator further includes a rotation angle position holding part configured to hold a rotation angle position of the rotation shaft at a neutral position by a magnetic attraction force generated between the magnet and the rotation angle position holding part , the rotation angle position holding part being disposed on the fixed part so as to face the magnet via the air gap (G), and characterized in that the fixed part includes a first support and a second support disposed so as to face each other with the magnet therebetween in a direction of the axis, the rotating shaft is rotatably attached to the first support via the first bearing and to the second support via the second bearing , and one of the first bearing or the second bearing is a rolling bearing, and the other of the first bearing or the second bearing is a slide bearing. <EOS>