A voltage-controlled oscillator having a triple-push structure is disclosed. The voltage-controlled oscillator having a triple-push structure may include: a voltage-controlled oscillation part including a multiple number of oscillation circuits configured to output an output signal based on a control voltage, where the multiple oscillation circuits are connected in a triple-push structure; a multiple number of phase shifters connected respectively to the output ends of the oscillation circuits and configured to change a phase of the output signals outputted from the output ends of the oscillation circuits; and an output part configured to output a final output signal by adding the output signals that are outputted with changed phases from the multiple phase shifters.