It is an object of the present invention to shorten a time required until phases of output signals being output from two output terminals are inverted respectively from a start time of an oscillation in a differential oscillation apparatus. In a differential oscillation apparatus according to the present invention which includes a differential oscillator portion 103 having an external input terminal at a terminal of one transistor 105 and a switch circuit 104, a first control signal generation circuit 101 for generating a first control signal to control an oscillation start and an oscillation stop of the differential oscillator portion 103, and a second control signal generation circuit 102 for generating a second control signal input into the terminal of one transistor 105 of the differential oscillator portion 103, when a phase relationship between collector currents flowing through two transistors 105, 106 is decided by the second control signal, output signals being output from two output terminals are opposite in phase from a start time of an oscillation.