An electromagnetic switch device for a starter, comprising: a pair of main fixed contacts forming a main electric circuit for a motor; a pair of starting circuit contacts forming a starting circuit for the motor; a main movable contact which is movably located between the pair of main fixed contacts and the pair of starting circuit contacts, which opens and closes the main electric circuit by opening and closing the pair of main fixed contacts, and which opens and closes the starting circuit by opening and closing the pair of starting circuit contacts; a starting resistor which forms the starting circuit and through which a starting current for the motor may flow; an attraction coil generating a magnetic field for moving a main movable core toward the pair of main fixed contacts; a main fixed core forming a magnetic circuit generating for magnetic force by the magnetic field of the attraction coil; a terminal block to which the pair of main fixed contacts are fixed and which includes a contact chamber that is a space in which the main movable contact is movable; an A connector which forms the starting circuit, which is connected to the starting resistor, and which has an end at which one of the pair of starting circuit contacts is located; a B connector which forms the starting circuit, which is connected to one of the pair of main fixed contacts, and which has an end at which one of the pair of starting circuit contacts is located; characterized in that an insulating member electrically insulating the A connector and the B connector from the main fixed core; and an elastic member sealing the contact chamber, wherein the A connector and the B connector are held between the terminal block and the main fixed core with the insulating member and the elastic member interposed therebetween. a pair of main fixed contacts forming a main electric circuit for a motor; a pair of starting circuit contacts forming a starting circuit for the motor; a main movable contact which is movably located between the pair of main fixed contacts and the pair of starting circuit contacts, which opens and closes the main electric circuit by opening and closing the pair of main fixed contacts, and which opens and closes the starting circuit by opening and closing the pair of starting circuit contacts; a starting resistor which forms the starting circuit and through which a starting current for the motor may flow; an attraction coil generating a magnetic field for moving a main movable core toward the pair of main fixed contacts; a main fixed core forming a magnetic circuit generating for magnetic force by the magnetic field of the attraction coil; a terminal block to which the pair of main fixed contacts are fixed and which includes a contact chamber that is a space in which the main movable contact is movable; an A connector which forms the starting circuit, which is connected to the starting resistor, and which has an end at which one of the pair of starting circuit contacts is located; a B connector which forms the starting circuit, which is connected to one of the pair of main fixed contacts, and which has an end at which one of the pair of starting circuit contacts is located; characterized in that an insulating member electrically insulating the A connector and the B connector from the main fixed core; and an elastic member sealing the contact chamber, wherein the A connector and the B connector are held between the terminal block and the main fixed core with the insulating member and the elastic member interposed therebetween.