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Abstract

An optical pickup apparatus having first and second light sources emitting first and second light fluxes having wavelength of .lamda.1 and .lamda.2, respectively, an light-converging optical system including first and second objective optical elements, and a lens holder to hold the first and second objective optical elements. When the optical pickup apparatus converges the first or the second light flux onto first or second information recording surface of first or second information recording medium through one protective substrate, which has a thickness of t1 or t2 and is provided on the first or second information recording surface, with utilizing the first or second objective optical element for conducting information recording and/or information reproducing of the first or second information recording medium, a variation of each of a coma aberration and an astigmatism is not more than 0.02 .lamda.1 rms or 0.02 .lamda.2 rms, respectively.

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