An electromagnetic switch device for starter includes a connector assembly which has a plurality of connectors formed by stamping a conductive material and which forms a motor electric circuit and an electric circuit for supplying power to an attraction coil and a holding coil, wherein the connector assembly includes: a connector (A) connecting one of a pair of sub fixed contacts and a battery terminal; a connector (B) connecting the other one of the pair of sub fixed contacts, and one end of the attraction coil and one end of the holding coil; a connector (C) connecting the other end of the attraction coil and a motor terminal; a connector (D) connecting one end of a sub coil and an S terminal; and a resin member integrally fixing at least one pair of the connector (A), the connector (B), the connector (C), and the connector (D).