To solve problems of a starter current-carrying circuit at low cost that, a starter motor requires 400-500 A in starting, however, a rush current is generated at an initial time of starting the current-carrying, a large current such as 1000 A flows through the starter motor and for preventing the rush current, the control of the large current of 1000 A, which is impossible at low cost, is required.

Four armature coils 4a-4d mounted on a armature 4 are current- carried by two sets of brushes 9a-9d. The current-carrying to one plus electrode brush 9b is interrupted by a switching means 10 for only a short moment after starting the current-carrying to the starter motor 2. As a result, right after the current-carrying of the starter motor 2, a circuit resistance value of the armature 4 increases so as to suppress the generation of the rush current. The rush current can be thus suppressed by just stopping the energization of one plus electrode brush 9, which can be materialized at a relatively low cost.