Fuel piping for a vehicle, which is fixed by clamps and routed on a vehicle body, is formed to have a circular hollow section inside and anisotropy in a wall thickness thereof in the circumferential direction. In particular, the fuel piping for a vehicle has at least one thick-wall portion in the circumferential direction and is disposed on a vehicle body so that the thick-wall portion is positioned vertically at the top or bottom, or has one thick-wall portion in the circumferential direction and is disposed on the vehicle body so that the thick-wall portion is positioned vertically at the top. In addition, the clamp for fixing to the vehicle the fuel piping for a vehicle includes a holding portion for arranging the thick-wall portion vertically at an end, and holding the fuel piping for a vehicle so as not to be turned in the circumferential direction thereof.