Patent ID: 7672197

Claim:
An optical pickup device comprising: a lens through which light transmits; a holder to which the lens is mounted; a position adjusting member which is mounted on the holder; and a housing to which the holder is mounted, wherein a lens assembly is formed by mounting the lens and the position adjusting member on the holder; the holder is formed in an approximate cylindrical shape; a mounting hole through which the lens assembly can be inserted is provided in the housing; a protrusion which contacts an inner periphery of the mounting hole is provided on an outer periphery of the holder; the protrusion is formed in an approximate triangle shape when the holder is viewed from a side from which the holder can be seen as a ring; a base portion of the protrusion corresponding to a base of the triangle is provided on the outer periphery of the holder; the housing has a structure which allows adjustment of a mounting position of the lens assembly when the lens assembly is assembled to the housing; and a tip portion of the protrusion corresponding to a vertex of the triangle is in contact with the inner periphery of the mounting hole having an approximate circular shape.