A method of producing a porous article, the method comprising: a first step of coating pores of at least a principal surface of a porous body, which is formed of an inorganic material, with a first mixed solution containing metal oxide particles, an alkaline silicate, and water to fill the pores with the first mixed solution; a second step of removing a residual first mixed solution which is not used for filling the pores; and a third step of further coating the entire surface of the porous body containing the pores, from which the residual first mixed solution is removed, with a second mixed solution containing an aqueous alkaline zirconium carbonate solution and either an aqueous silicate solution or a colloidal silica, wherein the metal oxide particles are α-type aluminum oxide particles having a corundum structure, the alkaline silicate is lithium silicate, and a mass ratio (aluminum oxide particles:lithium silicate:water) of aluminum oxide particles, lithium silicate, and water in the first mixed solution is (40 to 60):(1 to 10):(30 to 59); a D50 value of a particle size distribution of the aluminum oxide particles is 0.5 μm to 5 μm, a D90 value of the particle size distribution of the aluminum oxide particles is 3 μm or more; and the second mixed solution is one of the group consisting of a mixed solution A and a mixed solution B, wherein the mixed solution A contains 0.5 mass% to 15 mass% of zirconium in terms of zirconium dioxide and 0.005 mass% to 7.5 mass% of silicate or colloidal silica in terms of silicon dioxide, and when a total mass of zirconium dioxide and silicon dioxide is 100 parts by mass, a mass of silicon dioxide is 1 part by mass to 50 parts by mass, and the mixed solution B contains 0.005 mass% to 4.5 mass% of zirconium in terms of zirconium dioxide and 0.5 mass% to 15 mass% of silicate or colloidal silica in terms of silicon dioxide, and when a total mass of zirconium dioxide and silicon dioxide is 100 parts by mass, a mass of zirconium dioxide is 1 part by mass to 30 parts by mass. a first step of coating pores of at least a principal surface of a porous body, which is formed of an inorganic material, with a first mixed solution containing metal oxide particles, an alkaline silicate, and water to fill the pores with the first mixed solution; a second step of removing a residual first mixed solution which is not used for filling the pores; and a third step of further coating the entire surface of the porous body containing the pores, from which the residual first mixed solution is removed, with a second mixed solution containing an aqueous alkaline zirconium carbonate solution and either an aqueous silicate solution or a colloidal silica, wherein the metal oxide particles are α-type aluminum oxide particles having a corundum structure, the alkaline silicate is lithium silicate, and a mass ratio (aluminum oxide particles:lithium silicate:water) of aluminum oxide particles, lithium silicate, and water in the first mixed solution is (40 to 60):(1 to 10):(30 to 59); a D50 value of a particle size distribution of the aluminum oxide particles is 0.5 μm to 5 μm, a D90 value of the particle size distribution of the aluminum oxide particles is 3 μm or more; and the second mixed solution is one of the group consisting of a mixed solution A and a mixed solution B, wherein