To provide a fuel injection rail that easily absorbs pulsations, vibrations and the like, reduces stress the stress on the body thereof, and has improved resilience against high pressure.

In the pipe-shaped fuel injection rail (1) having a fuel rail passage (2) formed therein, the shape of the cross-section thereof is polygonal, and one side or more of the sides forming the polygonal cross-section is formed so as to have thin-walled sections (4) having a thin wall and a thick-walled section (5) having a thick wall in the lengthwise direction of the pipe. The one side or more of the sides forming the polygonal cross-section of the pipe may have the thin-walled sections (4) formed on both ends thereof, and the thick-walled section (5) formed in the center between the thin-walled sections (4).