A cable includes a silicone rubber coating including microparticles and cavities as an outermost coating. A medial hollow tube includes a silicone rubber coating including microparticles and cavities as an outermost coating or an innermost coating. The microparticles may be at least one kind of microparticle selected from silicone resin microparticle, silicone rubber microparticle and silica microparticle. The microparticles may have hardness higher than a hardness of silicone rubber constituting the silicone rubber coating.