To provide a temperature compensation type crystal oscillation circuit which can decrease the number of its parts and also can improve the temperature stability of its oscillation frequency.

The resistance 8 of a temperature compensation circuit is formed on a film circuit substrate 7 to output the control voltage of temperature compensation to a varactor diode that is inserted in series to a crystal vibrator. Then the film resistance is cut to control the output voltage of the temperature compensation circuit. The resistor of the temperature compensation circuit is also used as a heating element, and the heating value is controlled based on the current value of the resistor set at every temperature. Thus, it is possible to attain the high frequency stability in a wide ambient temperature range with no addition of any special circuit compared with a conventional temperature compensation type crystal oscillator.