TIRE TESTING DEVICE

To make it possible to perform bench tests of tires in various road surface conditions by causing a carriage holding a test tire to travel along a road surface without moving the road surface during the test. [0002] A tire testing device according to an embodiment of the present invention includes a road surface, a carriage configured to rotatably hold a test wheel on which a test tire is mounted and capable of traveling along the road surface in a state where the test tire is in contact with the road surface, and a guide mechanism configured to guide movement of the carriage in a traveling direction. The guide mechanism includes a rail extending in the traveling direction of the carriage, and a runner fixed to the carriage and capable of travelling on the rail. The runner includes a roller capable of rolling on the rail, and a bearing configured to rotatably support the roller. The bearing is a rolling bearing including rolling elements rolling on a circular track.