Abstract: The present invention relates to a device for measuring swing velocity of a golf club head sing a resonance circuit. The device according to the present invention comprises a resonance circuit portion for detecting impedance change amount and voltage signal by the amount of impedance change in response to the approach of a golf club head having conductivity; an amplification portion for amplifying the voltage signal detected by the resonance circuit portion, a wave shaping portion for outputting the voltage signal as pulse-shaped peak wave; a mircocomputer for controlling the operation of calculating the time difference between the peak waves and indicating swing velocity; and a display portion for displaying the swing velocity data according to the output signal of the microcomputer.