A gasket material including a steel plate and a foamed rubber layer

The present invention relates to a gasket material including a steel plate and a foamed rubber layer formed on one or both sides of the steel plate. The foamed rubber layer is obtained from a rubber composition containing :NBR, H-NBR or functional group-modified NBR, as a rubber compound; and a crosslinking agent, the crosslinking agent comprising at least one selected from the group consisting of p-quinone dioxime, p, p' -dibenzoylguinone dioxime and poly-p-dinitrobenzene. The foamed rubber layer has a quinoid crosslinking structure.