An optical information reading apparatus comprises an optical integration circuit type pickup in which an optical waveguide for guiding light and a condensing coupler for condensing the guided light propagating within the optical waveguide are formed on an optical integration circuit substrate, sub-couplers for radiating a part of the injected light upon the information recording surface in the vicinity of a light spot formed by the optical pickup and subsidiary light detection elements for receiving reflection light of the light radiated from the sub-couplers reflected from the information recording surface. The sub-couplers and the subsidiary light detection elements are formed integrally with the optical pickup on the optical integration circuit substrate. Thereby the detection error can be reduced, it is not necessary to use attachment parts and therefore the apparatus can be integrated to thereby make it possible to minimize the size.