A light receiving and emitting integrated device is provided that can be connected to an IC for an optical pickup of the discrete package type, regardless of use of the knife edge method for a focus servo signal. In the light receiving and emitting integrated device, a diffraction grating branches light emitted from a semiconductor laser into three, namely, first to third lights, a hologram element divided into four regions, namely, first to four regions divides the first to third lights reflected by an optical recording medium, and four light receiving segments provided in a light receiving element receive and detect the first light. A focus servo signal can be obtained by the knife edge method using detection outputs of the first light received and detected by the four light receiving segments.