US Patent 7626773 Lens unit

A lens unit includes a lens barrel (7) with a through hole (6), a first lens (8a) press-fitted into the through-hole (6), a first step (9a) catching an outer edge of the first lens (8a) in the through-hole (6), a second lens (8b) press-fitted into the through-hole (6) in a direction of an optical axis of the first lens (8a), and a second step (9b) catching an outer edge of the second lens (8b) in the through-hole (6). The second lens (8b) has a diameter larger than that of the first lens (8a). A third step (10a) or a sloped portion broadening the through hole from the first lens to the second lens is further provided.