A measuring device includes: a light source that emits light pulse groups toward a target part of an object, the light pulse groups each including light pulses emitted sequentially; a photodetector that detects at least a part of reflected light pulse groups, the reflected light pulse groups each including reflected light pulses sequentially returning from the target part; and a control circuit that controls the light source and the photodetector. The control circuit causes the light source to emit the light pulse groups and causes the photodetector to extract a component of light included in a last reflected light pulse of the reflected light pulses included in each of the reflected light pulse groups during a falling period and output an electric signal corresponding to the component of light.