Provided is a wireless 12-lead or multiple unipolar-lead electrocardiograph system without cable connection between a measurement electrode and device body. The present invention includes a measurement electrode that acquires an electrocardiographic signal of a subject, a Wilson terminal that is connected to the measurement electrode and forms an indifferent electrode, and an electrocardiograph body that generates an electrocardiogram. The measurement electrode has active measurement electrodes that wirelessly communicate with the electrocardiograph body, and passive measurement electrodes that are connected to the active measurement electrodes, and the Wilson terminal. The electrocardiograph body generates the electrocardiogram on the basis of a lead signal sent by the active measurement electrodes.