A sealing material is provided, which has excellent sealing property, with cracks, fracture, and deformation being minimized. The sealing material of the invention is prepared by vulcanizing and foaming a mixture containing a rubber component containing a copolymer rubber of ethylene, an α-olefin having 3 or more carbon atoms, and a non-conjugated diene, a vulcanizing agent, and a blowing agent, and then subjecting the mixture to a cell breakage treatment, characterized in that the mixture further includes a fatty acid calcium salt and a fatty acid zinc salt.