A sub-mobility device charging system for a vehicle is capable of moving while carrying a sub-mobility device in which passengers sit. The system includes a main electric power supply unit, a main electric power receiving unit, a main battery, a main electric power supply circuit, and a controller. When external charging is required depending on a total amount of the electric power stored in the main battery of the vehicle and a sub-battery of the sub-mobility device, the controller generates or selects a traveling route to pass through a road or a point where the main electric power receiving unit can be supplied with electric power from the outside of the vehicle.
