A measuring device, comprising - a light source unit for projecting a pulsed distance measuring light toward an object to be measured, - a projecting light optical system for projecting said pulsed distance measuring light emitted from said light source unit on said object to be measured, - a light receiving optical system for receiving a reflected pulsed distance measuring light from said object to be measured, - a light receiving part having a single photodetector for detecting said reflected pulsed distance measuring light as received, and - a control unit for measuring a distance by measuring time from light emission of said pulsed distance measuring light to receipt of the reflected pulsed distance measuring light based on a detection signal from said photodetector, wherein said light source unit has - a plurality of light emitting sources disposed in a known and selected arrangement with respect to the optical axis of said projecting light optical system, the device being characterized in that it comprises: - a driving unit for driving the light emitting sources sequentially at a predetermined time interval, said light receiving part having as many light receiving optical fibers as said light emitting sources, incident end surfaces of each light receiving optical fiber and each light emitting surface of said light emitting sources are disposed so as to be conjugate to each other, and at an exit side of said light receiving optical fibers, said light receiving part having an aggregate light optical fiber used for guiding said reflected pulsed distance measuring lights, which are received by said light receiving optical fibers, to said photodetector, said driving unit being configured to set said predetermined time interval to longer than a time of said pulsed distance measuring light to reach and come back from said object to be measured both ways, and wherein said control unit is designed to identify a photodetection signal from said photodetector by matching with said light emitting source, to detect detection signals of said reflected pulsed distance measuring light for each said pulsed distance measuring light, and to perform distance measurement for each pulsed distance measuring light. - a light source unit for projecting a pulsed distance measuring light toward an object to be measured, - a projecting light optical system for projecting said pulsed distance measuring light emitted from said light source unit on said object to be measured, - a light receiving optical system for receiving a reflected pulsed distance measuring light from said object to be measured, - a light receiving part having a single photodetector for detecting said reflected pulsed distance measuring light as received, and - a control unit for measuring a distance by measuring time from light emission of said pulsed distance measuring light to receipt of the reflected pulsed distance measuring light based on a detection signal from said photodetector, wherein said light source unit has - a plurality of light emitting sources disposed in a known and selected arrangement with respect to the optical axis of said projecting light optical system, the device being characterized in that it comprises: - a driving unit for driving the light emitting sources sequentially at a predetermined time interval, said light receiving part having as many light receiving optical fibers as said light emitting sources, incident end surfaces of each light receiving optical fiber and each light emitting surface of said light emitting sources are disposed so as to be conjugate to each other, and at an exit side of said light receiving optical fibers, said light receiving part having an aggregate light optical fiber used for guiding said reflected pulsed distance measuring lights, which are received by said light receiving optical fibers, to said photodetector, said driving unit being configured to set said predetermined time interval to longer than a time of said pulsed distance measuring light to reach and come back from said object to be measured both ways, and wherein said control unit is designed to identify a photodetection signal from said photodetector by matching with said light emitting source, to detect detection signals of said reflected pulsed distance measuring light for each said pulsed distance measuring light, and to perform distance measurement for each pulsed distance measuring light.