An distance measurement apparatus includes a light source to emit irradiation light, circuitry to output, to the light source, a first current that changes in accordance of light-emission timing information defining at least turn-on timing of the light source, and a second current that does not change in accordance of the light-emission timing information, a sensor to detect reflection light reflected from an object irradiated with the irradiation light emitted from the light source. The circuitry calculates a distance to the object based on a detection amount of the reflection light detected by the sensor.