The present invention provides a digitally controlled oscillator device capable of reducing noise away from an oscillation frequency, and a high frequency signal processing device. Fractional capacitances are realized using a plurality of unitary capacitor units, for example. In one unitary capacitor unit, one ends of two types of capacitive elements are respectively coupled to oscillation output nodes. On the other hand, in the unitary capacitor units other than the one unitary capacitor unit, one ends of two types of capacitive elements are respectively coupled to a fixed voltage. The other ends of one capacitive elements in all the unitary capacitor units are coupled in common, and the other ends of other capacitive elements are also coupled in common. Turning on and off of respective switches in all the unitary capacitor units are controlled in common.