To provide a variable capacity composite component having a large capacitance change rate, as a whole, by bringing out the essential capacitance change of each variable capacitance capacitor to the maximum.

Variable capacitance capacitors 31-34 are connected in series with signal terminals 12, 13 while facing the bias application ends each other alternately. A power supply terminal 11 is connected to the bias + side of the variable capacitance capacitors 31, 32 via a bias resistor 21 of a first bias line BL1, and to the bias + side of the variable capacitance capacitors 33, 34 via a bias resistor 22. A ground terminal 14 is connected to the bias - side of the variable capacitance capacitor 31 via a bias resistor 23 of a second bias line BL2, to the bias - side of the variable capacitance capacitors 32, 33 via a bias resistor 24, and to the bias - side of the variable capacitance capacitor 34 via a bias resistor 25. The values of the bias resistors 21, 22, 24 are set to one half those of the bias resistors 23, 25.