Patent ID: 7990813

Claim:
An optical pickup device comprising: a housing; a light-emitting element that emits light; a light-receiving element that receives the light; a shaft to which a lubricant is applied; and an optical-component mounting member that is attached to the shaft in a movable manner and has an optical component; wherein the housing includes: three walls connected together whose horizontal cross-section is substantially U-shaped, a first wall of the three walls supporting one end of the shaft, a second wall of the three walls facing the first wall and supporting the other end of the shaft, a third wall connecting the first wall and the second wall; and a retainer plate provided so as to be surrounded by the three walls and the shaft, and wherein a radius of curvature formed on a horizontal cross-section of the three walls is larger than a radius of curvature formed between one of the three walls and the retainer plate.