A lens unit for a light picker is provided with an objective lens for converging the emergent light coming from a light source to an information recording surface of a light information recording medium; a phase control element of an optical surface, which is provided with a phase structure controlling the phase of the emergent light coming from the light source and is arranged at the light source side corresponding to the objective lens; and a supporting component for supporting the objective lens and the phase control element, wherein, the phase control element prescribes the angle according to the optical axis inclination of the objective lens corresponding to an optical axis of the phase control element; moreover, the junction of the optical axis of the phase control element and the optical surface with the phase structure is kept by the state arranged on the central prolonged optical length of the optical axis of the objective lens.