A baffle for an automotive fuel tank that can be firmly fixed in the fuel tank and prevent flow noises effectively. The baffle is established in a fuel tank in which touching portions are formed in such a manner that a predetermined portion of an upper wall protrudes down and inward and a predetermined portion of a lower wall protrudes up and inward in the corresponding position. A fixing baffle plate and a pressing baffle plate are provided including fixing portions formed on both sides of plate portions having a plurality of holes. A baffle filter is disposed between the plate portions of the baffle plates and fixed as the baffle plates are assembled with each other. The baffle is fixedly established by suspending the fixing portions of the two baffle plates on both sides of the touching portions such that the baffle stands vertically in the fuel tank.