A method for manufacturing an aluminum circuit board, comprising: a step of spraying heated metal powder containing aluminum particles and/or aluminum alloy particles to a ceramic base material, and thereby forming a metal layer on a surface of the ceramic base material, wherein the temperature of greater than or equal to 80 mass% of the total amount of the metal powder is higher than or equal to the softening temperature of the metal powder and lower than or equal to the melting point of the metal powder at a time point of reaching the surface of the ceramic base material, and the softening temperature is a temperature that is defined as a value of melting point × 0.6 in the absolute temperature scale, wherein the velocity of at least a part of the metal powder is greater than or equal to 450 m/s and less than or equal to 1000 m/s at the time point of reaching the surface of the ceramic base material and in the particle diameter distribution of the metal powder, the particle diameter D 10 , which is the diameter at which 10% of the sample's mass is comprised of particles with a diameter less than this value, is greater than or equal to 10 μm, and the particle diameter D 90 , which is the diameter at which 90% of the sample's mass is comprised of particles with a diameter less than this value, is less than or equal to 50 μm, the aluminum alloy particles are particles consisting of aluminum; magnesium of less than or equal to 7.5 mass% on the basis of the mass of the aluminum alloy particles; and residual inevitable impurities, and wherein the metal powder is sprayed with a warm spraying device comprising a tubular body including an outlet nozzle and a barrel portion , the outlet nozzle includes a divergent nozzle, the barrel portion is a straight cylindrical barrel connected to the outlet nozzle in a continuous manner, and the metal powder is fed from a powder feed port provided between the outlet nozzle and the barrel portion to the inlet of the barrel portion . a step of spraying heated metal powder containing aluminum particles and/or aluminum alloy particles to a ceramic base material, and thereby forming a metal layer on a surface of the ceramic base material, wherein the temperature of greater than or equal to 80 mass% of the total amount of the metal powder is higher than or equal to the softening temperature of the metal powder and lower than or equal to the melting point of the metal powder at a time point of reaching the surface of the ceramic base material, and the softening temperature is a temperature that is defined as a value of melting point × 0.6 in the absolute temperature scale, wherein the velocity of at least a part of the metal powder is greater than or equal to 450 m/s and less than or equal to 1000 m/s at the time point of reaching the surface of the ceramic base material and in the particle diameter distribution of the metal powder, the particle diameter D 10 , which is the diameter at which 10% of the sample's mass is comprised of particles with a diameter less than this value, is greater than or equal to 10 μm, and the particle diameter D 90 , which is the diameter at which 90% of the sample's mass is comprised of particles with a diameter less than this value, is less than or equal to 50 μm, the aluminum alloy particles are particles consisting of aluminum; magnesium of less than or equal to 7.5 mass% on the basis of the mass of the aluminum alloy particles; and residual inevitable impurities, and wherein the metal powder is sprayed with a warm spraying device comprising a tubular body including an outlet nozzle and a barrel portion , the outlet nozzle includes a divergent nozzle, the barrel portion is a straight cylindrical barrel connected to the outlet nozzle in a continuous manner, and the metal powder is fed from a powder feed port provided between the outlet nozzle and the barrel portion to the inlet of the barrel portion . <EOS>