Optical pickup device and an optical information recording and / or reproducing apparatus

It condenses the first light flux of the first wavelength .lambda.1 to the first optical disc information recording surface of the recording density .rho.1, the recording density ρ2 (ρ2 λ1) is converged onto the information recording surface of the second optical disk, an objective for converging the third wavelength [lambda] 3 recording density of the third light flux (λ3> λ2) ρ3 third optical information recording surface of the ([rho] 3 <[rho] 2) an optical system, said objective optical system has a phase structure, the first optical disc, the second optical disc, recording and / or magnification of the first magnification when reproducing information with respect to the third optical disk M1, second magnification M2, when the third magnification M3, the absolute value of the difference between the first magnification M1 and the second magnification M2 |