Tracking error detection device of present invention is provided wherein the output of PIN photo diode 1a to 1d generated according to its respective assembly concerned, is transformed by selectors 11a, 11b, and then sent to a phase error detection circuit 13 of last section. The output of said phase error detection circuit 13 is further input into a low-pass filter of last section. In the tracking error detection device thus constructed, phase error detection means and low-pass means for the detection of tracking error signal can be shared with the phase error detection means and low-pass means for the detection of off-set signal. The shared phase error detection means and low-pass means can be used in a time sharing way, so that tracking error signal and off-set signal can be detected. Therefore, in the optical-record reproduction device, the effect of miniaturization and low power consumption of a circuit for the control of tracking a pick-up light can be obtained.
Tracking error detection device