A heartbeat measurement device includes a transmitter configured to transmit a transmission signal from a transmission antenna to a person to be measured, a receiver configured to receive a signal reflected from the person to be measured as a reception signal using a reception antenna, and an orthogonal detection circuit configured to generate an I signal that is an in-phase component of the transmission signal and the reception signal and a Q signal that is a quadrature component of the transmission signal and the reception signal. The heartbeat measurement device further includes a Fourier transform unit configured to calculate a spectrum in positive and negative frequency domains on the basis of the I signal and the Q signal and a signal processing unit configured to compare positive and negative frequency components in the spectrum to extract a heartbeat component.
