To reduce a noise to be produced by a movement of fuel in a fuel tank during the travel of an automobile.

A fuel tank 10 is provided with a cylinderlike wall member 12 set up at a space from a front end 28 or a rear end 30 in looking from a traveling direction 22. This wall member 12 is extending over a substantial part of at least height and width of this tank 10. An acute angle is formed in space between the wall member 12 and a sidewall of the tank 10. In addition, this wall member 12 is formed with a hole 34 to allow a pass of fuel and an edge recess 32 in combination. A boundary surface of the wall member 12 partitions off an inner part of the fuel tank 10, and a clearance gap with an end wall of the tank 10 is selected so as to be insufficient for making a fuel quantity being contained therein produce a noise by means of fuel motion.