A device for holding a laser diode (LD) and a collimate lens. A laser unit
includes an LD supporting section supporting the LD, and a lens
supporting section supporting the lens positioned opposite to the LD, A
connecting portion connects the lens supporting section to the LD
supporting section. An adjustment section for adjusting a relative
position between the LD and the lens is provided in association with the
LD supporting section. The adjustment section allows the LD supporting
section to be movable and position-fixable with respect to the lens
supporting section as if the LD supporting section serves as a leverage
about the connecting portion functioning as a fulcrum.