To provide a rubber cushion with an excellent proofing characteristic in which a low dynamic spring characteristic is compatible with high damping one while securing an excellent vibration proofing characteristic and an enough endurance.

An SBR component excluding an unvulcanized liquid component is dispersed in an island phase within a matrix composed of an vulcanized diene rubber, and forms a sea-island structure to give a high damping characteristic by vucanizing a composite which is formed by compounding a liquid SBR in a specified glass transition temperature from -35 to -10 degrees Celsius in a unvulcanized diene rubber material.