A fixing member has a support and a surface layer, wherein the surface layer is a rubber mold-releasing layer containing a mixture of a fluorocarbon rubber and dimethyl silicone rubber, the rubber mold-releasing layer has an island-in-sea structure, the dimethyl silicone rubber stands as an island phase, the fluorocarbon rubber stands as a sea phase, the island phase is a dispersion phase and the sea phase is a continuous phase, an average particle diameter of the island phase in the sectional plane of the rubber mold-releasing layer is 20 .mu.m or less and the combining proportion of the fluorocarbon rubber and the dimethyl silicone rubber falls within a range of 20:80 to 80:20 in terms of a volume proportion.