Objective optical element and an optical pickup device

Objective optical element according to the present invention is used in the optical pickup device comprising a light source for a light beam of three different wavelengths, a converging optical system including an objective optical element, reproducing information on an optical information recording medium and / or when recording is on the objective optical element, the light flux emitted from the light source enters almost infinite parallel light flux. The objective optical element is composed of two or more optical elements has a first surface where the first phase difference providing structure is formed, a second surface second phase difference providing structure is formed , wherein the first phase difference providing structure second phase difference providing structure, when the light flux of the three different wavelengths are incident on the respective structural diffracted light beam respectively are emitted with three light beams, or has the structure transmitting light beam is emitted not subjected to each diffracting action with the three light beams.