The present application makes it possible to measure a PWM signal in a wide frequency range. A PWM signal measurement device (20) includes: a first duty cycle measurement unit (24) of a capture type configured to measure a frequency (f) and a duty cycle of a PWM signal (Sc); a voltage measurement unit (23) configured to measure a smoothed voltage (Vad) obtained by smoothing the PWM signal using a smoothing circuit (13); a second duty cycle measurement unit (25) of a smoothing type configured to measure a duty cycle of the PWM signal on the basis of a measured voltage value (Vadm) of the smoothed voltage; and a measurement-type selecting unit (26) configured to select one of the capture type or the smoothing type on the basis of a measured value of the frequency and a measured value of the smoothed voltage.