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From the viewpoint of reducing fuel consumption and protecting the global environment, it is required to reduce CO2 emitted from transportation equipment. In order to solve this problem, it is required to improve the fuel efficiency of transportation equipment. Then, in order to improve fuel efficiency, it is necessary to suppress friction loss in the sliding part. Many surface treatment methods have been reported to suppress friction loss.1–8) Tachikawa has reported that DLC (diamond-like carbon) is coated on the sliding material to improve friction characteristics.5) Suzuki et al. investigated the hardness and friction properties of Cr–Mo–N coating.7) Pawlak et al. reported the results of measuring the friction coefficient by adding boron nitride to modify the surface of the bearing.8) However, these methods are difficult to deal with sliding materials with complicated shapes. Therefore, the authors considered Formation of Porous Stainless Steel Surface by Al Electrodeposition and Dissolution in the Molten Salt and Sliding Properties