To provide a trolley capable of following up even the forces in the directions other than the advancing direction on the assumption that a round pipe is used as a rail.

This single-rail suspension trolley applied to one rail at least the upper half of which is formed in a circular arc shape comprises a hourglass-shaped wheel in which a V-groove bilaterally symmetrically having tapered surfaces tilting toward the center is circumferentially formed and the tapered surfaces of the V-groove advance while rolling on the rail in the state of being brought into contact at two points with the upper half of the rail, a frame having a side plate rotatably supporting the wheel, and a load handling part positioned under the wheel and formed on the frame. The wheel is formed by integrally connecting a pair of blocks each having a conical surface to each other with the conical surfaces opposed to each other or cutting out the V-groove at the center of a cylindrical member. The wheel is made of a raw material capable of absorbing rolling noise such as rubber and synthetic resin.