An underwater sliding member used under water, comprising: a base material made of a first metal material; an intermediate layer of a porous structure having spherical members or wedge-shaped members made of a second metal material, the spherical members or the wedge-shaped members being joined to a surface of the base material, the spherical members or the wedge-shaped members being aligned along the surface of the base material and defining a first hole (121A, 221A); a corrosion inhibiting layer a part of which is melted and fills the first hole, the corrosion inhibiting layer covers the spherical members or the wedge-shaped members, the corrosion inhibiting layer defining a second hole which is formed after the first hole is covered by the corrosion inhibiting layer; and a sliding layer formed on said corrosion inhibiting layer and made of a resin material, a part of the sliding layer fills the second hole (122A, 222A), wherein the corrosion inhibiting layer is made of a material whose melting point is lower than that of the resin material of the sliding layer, wherein the first metal material of said base material is at least one of stainless steel made of iron and chromium, stainless steel made of iron, chromium, and nickel, and stainless steel made of iron, chromium, nickel, molybdenum, manganese, silicon, niobium, and titanium, wherein the second metal material of said intermediate layer is at least one of stainless steel made of iron and chromium, stainless steel made of iron, chromium, and nickel, and stainless steel made of iron, chromium, nickel, molybdenum, manganese, silicon, niobium, and titanium, wherein the resin material constituting said sliding layer contains a tetrafluoroethylene resin, wherein said sliding layer contains a filler made of a fiber and a particle which includes at least one of carbon and graphite, wherein said sliding layer contains an additional filler made of a whisker, fiber, and a particle, the whisker, the fiber, and the particle being made of at least one kind of potassium titanate, aluminum borate, and zinc oxide. a base material made of a first metal material; an intermediate layer of a porous structure having spherical members or wedge-shaped members made of a second metal material, the spherical members or the wedge-shaped members being joined to a surface of the base material, the spherical members or the wedge-shaped members being aligned along the surface of the base material and defining a first hole (121A, 221A); a corrosion inhibiting layer a part of which is melted and fills the first hole, the corrosion inhibiting layer covers the spherical members or the wedge-shaped members, the corrosion inhibiting layer defining a second hole which is formed after the first hole is covered by the corrosion inhibiting layer; and a sliding layer formed on said corrosion inhibiting layer and made of a resin material, a part of the sliding layer fills the second hole (122A, 222A), wherein the corrosion inhibiting layer is made of a material whose melting point is lower than that of the resin material of the sliding layer, wherein the first metal material of said base material is at least one of stainless steel made of iron and chromium, stainless steel made of iron, chromium, and nickel, and stainless steel made of iron, chromium, nickel, molybdenum, manganese, silicon, niobium, and titanium, wherein the second metal material of said intermediate layer is at least one of stainless steel made of iron and chromium, stainless steel made of iron, chromium, and nickel, and stainless steel made of iron, chromium, nickel, molybdenum, manganese, silicon, niobium, and titanium, wherein the resin material constituting said sliding layer contains a tetrafluoroethylene resin, wherein said sliding layer contains a filler made of a fiber and a particle which includes at least one of carbon and graphite, wherein said sliding layer contains an additional filler made of a whisker, fiber, and a particle, the whisker, the fiber, and the particle being made of at least one kind of potassium titanate, aluminum borate, and zinc oxide.