Abstract: A running device includes: a rubber crawler of an endless shape; a guide protrusion disposed in center, with respect to a width direction, of an inner circumferential surface of the rubber crawler; a driving protrusion disposed on each of opposite sides, with respect to the width direction, of the inner circumferential surface of the rubber crawler; and a track roller disposed over the guide protrusion, and configured to roll on the inner circumferential surface of the rubber crawler and to be in surface-contact with a side surface of the guide protrusion and a side surface of the driving protrusion. The track roller has side surfaces disposed on end portions with respect to the width direction, surface-contactable with the side surface of the guide protrusion and the side surface of the driving protrusion, respectively.

Abstract: A running device includes: a rubber crawler of an endless shape; a guide protrusion disposed in center, with respect to a width direction, of an inner circumferential surface of the rubber crawler; a driving protrusion disposed on each of opposite sides, with respect to the width direction, of the inner circumferential surface of the rubber crawler; and a track roller disposed over the guide protrusion, and configured to roll on the inner circumferential surface of the rubber crawler and to be in surface-contact with a side surface of the guide protrusion and a side surface of the driving protrusion. The track roller has side surfaces disposed on end portions with respect to the width direction, surface-contactable with the side surface of the guide protrusion and the side surface of the driving protrusion, respectively.

Abstract: A cushion tire is formed from a rubber material without being provided with an airspace inside the tire. An aspect ratio, which is a ratio of a sectional height of a tire with respect to a width of the tire, is set to 15 to 80%. And a number of holes are formed in both bilateral side surfaces of the tire along a circumferential direction thereof.

Abstract: A diameter of a wheel to which a tire is fitted is made large, and an inner circumferential space is widened, so that a brake having a large size can be arranged in such large inner circumferential space, and moreover, a spring constant can be lowered due to formation of holes to both bilateral side surfaces of the tire, whereby a cushioning performance can be made high and travelling feeling can be made comfortable.