PROBLEM TO BE SOLVED: To widen the lock range of an injection-type phase synchronization circuit.SOLUTION: An injection-type phase synchronization circuit includes: a reference signal source 1; a control-voltage generation circuit (a phase comparison circuit 21, a charge pump 22, a filter 23, and a divider 24) generating a control voltage Vfor controlling the frequency of an output signal fof the injection-type phase synchronization circuit by using a reference signal ffrom the reference signal source 1 and the output signal f; a harmonic mixer 3 mixing the reference signal fand the output signal f; a band-pass filter 4 passing only the frequency of the output signal ffrom a signal outputted from the harmonic mixer 3; and an injection-type synchronous oscillator 5 generating the output signal fby the frequency of a signal fpassed through the band-pass filter 4 and the control voltage V.
