Time measurement device, time measurement method, light-emission-lifetime measurement device, and light-emission-lifetime measurement method

A time measurement device calculates the time from the input of a first trigger signal to the input of a second trigger signal as a measurement time. The time measurement device is provided with a start gate for generating a start signal, a stop gate for generating a stop signal, a TDC circuit for generating a digital code corresponding to the time from the input of the start signal to the input of the stop signal, a delay circuit for delaying the input of the start signal and/or the stop signal to the TDC circuit by a prescribed delay time, and a control unit for calculating a measurement time on the basis of a plurality of digital codes generated by the TDC circuit. The delay circuit selects at least two delay times.