Abstract: A photodetector to be used to produce a track error signal or the like by receiving the reflected light of light beams radiated to an optical recording medium is formed of a plurality of photodetecting devices provided as divided on a common chip and is provided with either a; leaking current absorbing member for suppressing a leaking current form overflowing through the chip from the photodetecting device receiving a light beam of a large light amount into the other photodetecting devices causing noises; or with a circuit for preventing the generation of a leaking current.