Method for forming a thermal barrier coating of a gas-turbine-use high-temperature component, said component comprising: a substrate exposed to a high-temperature combustion gas; a thermal barrier coating; said thermal barrier coating being formed by providing an alloy bond-coat layer on a surface of the substrate, and further, by providing a thermal-barrier ceramic top-coat layer on the surface of said alloy bond-coat layer, characterized in that: • micro passages are provided inside said alloy bond-coat layer and said thermal-barrier ceramic top-coat layer, said micro passages being in communication from said substrate side to said surface side, a partial amount of coolant of a coolant for cooling said high-temperature component being caused to flow out to the outside of said high-temperature component via these micro passages; • cooling holes are provided in the substrate to cause a coolant to flow into the micro passages provided inside said alloy bond-coat layer; • said alloy bond-coat layer is formed on the surface of the substrate so as to cover the cooling holes, the substrate being provided with the cooling holes extending from the of the surface side of the substrate through to the side of the internal cooling-air passages; • said alloy bond-coat layer is equipped with an accumulated organization of alloy powder particles, the particle diameters' range of said alloy powder particles being a 5 μm to 100 μm range; • the partial ratio of the volume of said micro passages in the alloy bond-coat layer being equal to 30% to 70%, said micro passages being formed by clearances among said accumulated particles, and being in communication; • said alloy bond-coat layer is formed using a method of causing alloy powder particles to collide with said surface of the substrate at a high velocity, and without being accompanied by the melting of said alloy powder particles; and • said alloy powder particles are caused to collide with said surface of the substrate by accelerating said particles with an action gas whose temperature is lower than the melting point of said alloy. a substrate exposed to a high-temperature combustion gas; a thermal barrier coating; said thermal barrier coating being formed by providing an alloy bond-coat layer on a surface of the substrate, and further, by providing a thermal-barrier ceramic top-coat layer on the surface of said alloy bond-coat layer, • micro passages are provided inside said alloy bond-coat layer and said thermal-barrier ceramic top-coat layer, said micro passages being in communication from said substrate side to said surface side, a partial amount of coolant of a coolant for cooling said high-temperature component being caused to flow out to the outside of said high-temperature component via these micro passages; • cooling holes are provided in the substrate to cause a coolant to flow into the micro passages provided inside said alloy bond-coat layer; • said alloy bond-coat layer is formed on the surface of the substrate so as to cover the cooling holes, the substrate being provided with the cooling holes extending from the of the surface side of the substrate through to the side of the internal cooling-air passages; • said alloy bond-coat layer is equipped with an accumulated organization of alloy powder particles, the particle diameters' range of said alloy powder particles being a 5 μm to 100 μm range; • the partial ratio of the volume of said micro passages in the alloy bond-coat layer being equal to 30% to 70%, said micro passages being formed by clearances among said accumulated particles, and being in communication; • said alloy bond-coat layer is formed using a method of causing alloy powder particles to collide with said surface of the substrate at a high velocity, and without being accompanied by the melting of said alloy powder particles; and • said alloy powder particles are caused to collide with said surface of the substrate by accelerating said particles with an action gas whose temperature is lower than the melting point of said alloy.