(6n.+-.1), where n is an integer not smaller than 1 and y is 1/2 or 1; and (c) the stator coils are formed with three excitation feedingterminals of a star or delta connection.According to a second aspect of the present invention, provided is a three-phase stepping motor comprising: a rotation shaft rotatably supported by a pair of bearings provided in predetermined places of a housing so as to be