A seat section protecting structure, having a seat at the center thereof, is supported on a chassis frame so that it can swivel horizontally. While running, the lateral side of the seat is covered by the seat section protecting structure so as to protect the passenger from the risk of a collision from the side of the vehicle or a rollover, and while the passenger gets on/off, the seat section protecting structure swivels so that the opening, which allows the passenger to get on/off therethrough, is located on the lateral side of the vehicle. The vehicle has its seat and batteries arranged at optimal positions so as to increase the space efficiency and safety within a limited volume space. Moreover, a steering handle is provided, which is made while taking passenger accessibility into consideration, and an airbag unique to this vehicle is provided in order to increase safety.