The present invention relates to an information reproducing apparatus that includes an objective lens that focuses a light beam toward a rotating optical disc medium and uses the objective lens to focus the light beam onto the optical disc medium and detect the reflected light of the light beam so as to reproduce information stored on the optical disc medium. The present invention allows measurement of surface deflection of the optical disc medium with no risk of collision between the objective lens and the optical disc medium. The objective lens is brought closer to the optical disc medium from a separate position apart from the optical disc medium and immediately moved away from the optical disc medium when the light beam is focused onto the optical disc medium.