To provide a time-potential difference converter for converting a phase difference of two pulse signals into a potential difference with a simple circuit configuration.

The time-potential difference converter for converting a phase difference of two pulse signals into a potential difference comprises a first edge detector 1 for detecting a rising edge of one of the two pulse signals, a second edge detector 2 for detecting a rising edge of the other of the two signals, and an integrator 3 having an always constant change ratio of an output voltage by an integrating operation and starting the operation at the time of detecting the edge of the first edge detector 1 and ending the operation at the time of detecting the edge by the second edge detector 2.