Patent ID: 7330420

Claim:
An objective lens unit for converging a light flux onto an information recording plane of an optical information recording medium in an optical pickup apparatus, comprising: a first optical element arranged so as to be opposite to the optical information recording medium; and a second optical element arranged at a light source side of the first optical element so as to be opposite to the first optical element and including a ring-shaped structure in which plural ring-shaped zones are formed on at least one optical surface of the second optical element such that neighboring ring-shaped zones cause a predetermined optical path difference for incident rays; wherein the first optical element comprises: a first optical element functional section; and a first flange section integrally formed in one body around the first optical functional section, wherein the second optical element comprises: a second optical functional section; and a second flange section integrally formed in one body around the second optical function section, and wherein the first flange section and the second flange section come in contact with each other and are formed so as to fix the first and second optical elements at predetermined respective relative positions.