MEASURING DEVICE

The present invention provides a measuring device, comprising a light source unit 2 for projecting a pulsed distance measuring light 10 toward an object to be measured, a projecting light optical system 3 for projecting the pulsed distance measuring light emitted from the light source unit on the object to be measured, a light receiving optical system 4 for receiving a reflected pulsed distance measuring light 10' from the object to be measured, a light receiving part 6 having a single photodetector 12 for detecting the reflected pulsed distance measuring light as received, and a control unit 7 for measuring a distance by measuring time from light emission of the pulsed distance measuring light to receipt of the reflected pulsed distance measuring light based on a detection signal from the photodetector, wherein the light source unit has a plurality of light emitting sources 8 arranged in a known relation with respect to an optical axis of the projecting light optical system, and a driving unit 9 for driving the light emitting sources at a predetermined time interval, the light receiving part has a reduced optical system 11, 13 arranged at position conjugate to the light emitting source and used for guiding the reflected pulsed distance measuring light to the photodetector, and the control unit is designed to identify a photodetection signal 24 from the photodetector by matching with the light emitting source and to perform distance measurement for each photodetection signal.