Running device

A running device arranged on a running vehicle, comprising:

• a frame;
• and
• a first wheel part and a second wheel part arranged along a running direction and connected to the frame,
• the first wheel part including a first left support arm and a first right support arm respectively disposed on a left side and a right side with respect to the running direction and each connected to the frame in a manner to be swingable within a vertical plane extending along the running direction,
• the second wheel part including a second support arm connected to the frame in a manner to be swingable within a vertical plane perpendicular to the running direction,
• the first left support arm having a first left wheel on each of both sides of a center of swinging thereof, the first left wheels being each supported in a manner to be rotatable about a horizontal axle perpendicular to the running direction,
• the first right support arm having a first right wheel on each of both sides of a center of swinging thereof, the first right wheels being each supported in a manner to be rotatable about a horizontal axle perpendicular to the running direction,
• the second support arm having a second left wheel and a second right wheel respectively on both sides of a center of swinging thereof, the second left wheel and the second right wheel being each supported in a manner to be rotatable about a horizontal axle perpendicular to the running direction,
• the center of swinging of the first left support arm being positioned on a line connecting centers of the two first left wheels,
• the center of swinging of the first right support arm being positioned on a line connecting centers of the two first right wheels.