To improve durability of a self-propelling vehicle for turning with a sharp rotation radius.

A chassis has two driving wheels 4, forms at least one driving section, and supports a motor 5, and the motor is contraposively connected with a motion distribution shaft 6. A clutch coupling 12 is disposed between the motion distribution shaft 6 and each driving wheel, and can be operated or cannot be operated individually by a command for independently operating the driving wheels. The power transmission of each clutch coupling that has a steering means, is appropriate for functional connection, and is disposed between the motion distribution shaft and at least one driving wheel can be operated or cannot be operated by a steering device.