To provide a carrier machine which requires no replacement of a storage battery during charge, allows charge in a short time and achieves an increase in a service life of a storage battery.

The carrier machine is equipped with a chargeable and dischargeable auxiliary storage battery 3. A main storage battery 2 is chargeably formed of a charger 8 provided outside the machine, and has shorter charging time than the auxiliary storage battery 3 has and has chargeable and dischargeable frequency larger than that of auxiliary storage battery 3. The main storage battery 2 and auxiliary storage battery 3 are connected to a drive part 4 in parallel. The auxiliary storage battery 3 is charged by the current from the main storage battery 2.