The present disclosure relates to a delay device for checking a frequency modulated continuous wave (FMCW) radar, measuring a distance of a target and a relative velocity using microwaves and millimeter waves of a frequency modulated continuous waveform, and may include an input/output unit that is configured to input or output a control setting value, a controller that is configured to output a control signal corresponding to the control setting value input by an operator through the input/output unit, and a transceiver that is configured to delay an FMCW radar signal, for output, by a time delay corresponding to a distance of a target through a programmable single chip delay line according to the control signal of the controller, and configured to shift a frequency of the time-delayed FMCW radar signal by a Doppler frequency, and attenuate the frequency-shifted FMCW radar signal for output.