A distance measurement device according to the present disclosure includes: a light source configured to emit pulsed laser light； a superimposition portion configured to superimpose reflection light obtained by reflection of the pulsed laser light by an object to be measured and reference light that is the pulsed laser light； a saturation output portion, on which the reference light and the reflection light superimposed on each other are made incident, configured to output light having a saturated light quantity when incident light reaches a predetermined light quantity due to superimposition of pulses of the reflection light and the reference light； and a light-receiving portion configured to receive the light outputted from the saturation output portion.
