1. A magnetocardiograph for measuring magnetism to be generated from a subject's heart by at least one magnetic sensor comprising: storage means for storing a heart magnetic signal thus measured; calculation means for calculating a position of center of gravity of excitement wave front in a cardiac muscle excitement propagation process and a transition vector (hereinafter, referred to as a wave front vector) from information of the heart magnetic signal stored in said storage means; and display means for displaying an analysis result.