Starter with planetary reduction gear device

In a planetary reduction gear device of a starter (1), a planet carrier (18, 24) forms gear shafts (15) and planetary gears (10) are rotatably supported by the gear shafts (15) through bearings (14). The planet carrier further forms waste shafts (21) projecting in a direction same as that of the gear shafts (15) as secondary shafts. The waste shafts (21) are arranged on a circle (C2) having a center coincident with a rotation axis (O) of the planet carrier at regular intervals in a circumferential direction. The circle (C2) on which the waste shafts (21) are arranged has a diameter different from that of a circle (C1) on which the gear shafts (15) are arranged. A speed reduction ratio can be changed by mounting planetary gears having a gear specification different from that of the planetary gears (10) supported on the gear shafts (15) on the waste shafts (21). The planet carrier can be integrally formed with a clutch outer portion of a one-way clutch.