Abstract: A yoke, as embodied, includes a base having a center vent; at least a pair of inner yoke portions respectively located at both end edges of the center vent and protruding from the base to face each other, each of the inner yoke portions having a support protrusion, the support protrusions being respectively located at complementary positions of leading ends of the inner yoke portions; and at least a pair of outer yoke portions protruding from the base and facing each other.

Abstract: An optical pick-up actuator includes a lens holder, a magnetic circuit, a wire spring, a wire holder, and a damper material receptacle. The lens holder includes an objective lens. The magnetic circuit moves the lens holder. The wire spring is coupled at one end thereof to a side of the lens holder, and supports the lens holder. The wire holder fixes the other end of the wire spring. The damper material receptacle defines an insert hole and a through-hole, through which the other end of the wire spring is inserted and passes. The damper material receptacle holds a predetermined damper material that absorbs vibrations imparted on the wire spring. The damper material defines an injecting hole, through which the damper material is injected, separately from the insert hole and the through-hole.