To improve the straight-ahead stability of a wheelbarrow or the like and to prevent it from sinking in sandy, muddy or similar ground.

A tire 1 is provided with a circumferential groove 3 along a tread centerline and ground rings 4 on both width sides of the circumferential groove 3. In a radial section of the tire 1, the sectional outline connecting the circumferential groove 3 and both ground rings 4, 4 forms a "heart" shape drawn in a single smooth curve. When a wheelbarrow 2 with the tire 1 attached is moved on a road surface, both ground rings 4, 4 can ground to stabilize the movement, where a turning operation is just a shift of the center of gravity to the right or left. As to movement on a road surface G where the tire 1 is liable to sink, such as sandy ground, the smooth curve outlining both ground rings 4, 4 guides and accumulates sand or the like into the circumferential groove 3, so that the accumulated sand or the like can supportively prevent the tire 1 from sinking in the road surface G. The wheelbarrow 2 can thus be manipulated stably.