An information recording and/or reproducing apparatus capable of obtaining a certain recording/reproducing margin with a simplified structure. The apparatus identifies whether an optical disc is a single-layer recording medium having one recording layer or a multilayer recording medium having a plurality of recording layers, and sets a control range (movable range) of an object lens on the basis of the identification result. When the optical disc is identified as a multilayer recording medium, the control range of the object lens is set to be smaller than that for a single-layer recording medium. Further, the control range of the object lens is set for each of the recording layers of the optical disc.