PURPOSE: An optical pickup device including a collimate lens is provided to slim the optical device. CONSTITUTION: A light source(26) irradiates the light. A collimate lens converts the light emitted from the light source into a parallel light. A wave plate(16) polarizes the light passed through the collimate lens. An optical pickup device includes a objective lens forms optical spot to the optical disk by collecting the light passed through the wave plate. A divergence system lens(4a) diverges the light emitted from the light source. The convergence lens(4b) converts the light diverged from the divergence system lens into a parallel light.
