Sealing gasket

The purpose of the present invention is to suppress deterioration in sealing performance caused by corrosive foreign matter such as brine and a snow-melting agent while reducing reaction force in an attached state. A gasket (1) is provided with a metal substrate (10) made of metal, and a cover layer (20) which is formed of an elastic body and covers at least a portion of the metal substrate (10). The metal substrate (10) has a pair of upper surface (11) and lower surface (12) facing away from each other, and has a flange portion (13) as a portion protruding toward the side facing the upper surface (11), an inner peripheral portion (14) as a portion extending from an inner peripheral edge (13b) of the flange portion (13), and an outer peripheral portion (15) extending from an outer peripheral edge (13a) of the flange portion (13). The outer peripheral portion (15) extends obliquely toward the side facing the lower surface (12) with respect to the direction in which the flange portion (15) protrudes. 在降低安装状态下的反