A corrosion resistance test method for a coated metal material that includes a metal base (2, 3) and a surface treatment film provided on the metal base (2, 3), the corrosion resistance test method comprising the steps of: disposing one or more water-containing material holders each holding a water-containing material to be in contact with the surface treatment film and one or more electrodes to be in contact with the water-containing material contained in the one water-containing material holder or in each of the water-containing material holders, and electrically connecting, with an external circuit, between the one electrode and the metal base (2, 3), or between the electrodes; wherein the coated metal material has one or more damaged portions reaching the metal base (2, 3) through the surface treatment film, and said one or more water-containing material holders are disposed so as for the water-containing material to be in contact with the one damaged portion or the damaged portions; and supplying a current between the one electrode and the metal base (2, 3), or between at least one of the electrodes and at least one of the other electrodes, as an anode and a cathode, respectively from a current supplier provided on the external circuit to bring corrosion of the coated metal material to progress, wherein the water-containing material has a viscosity at 65°C of 10 mPa·s or more to 40 mPa·s or less, preferably 20 mPa·s or more to 40 mPa·s or less, wherein the water-containing material comprises water, an electrolyte material and a thickener, wherein the thickener is a polyether polyol-based urethane polymer, wherein the content of the polyether polyol-based urethane polymer in the water-containing material is 4.0 mass% or more to 15.5 mass% or less; wherein the step of bringing corrosion of the coated metal material to progress includes causing expansion of the surface treatment film to occur and progress, wherein the use of the water-containing material having the viscosity in the above-described range makes hydrogen which is generated in the contact portion between the water-containing material and the metal base (2, 3) be retained between the surface treatment film and the metal base (2, 3) and makes the internal pressure between the surface treatment film and the metal base (2, 3) increase, which accelerates lifting of the surface treatment film. disposing one or more water-containing material holders each holding a water-containing material to be in contact with the surface treatment film and one or more electrodes to be in contact with the water-containing material contained in the one water-containing material holder or in each of the water-containing material holders, and electrically connecting, with an external circuit, between the one electrode and the metal base (2, 3), or between the electrodes; wherein the coated metal material has one or more damaged portions reaching the metal base (2, 3) through the surface treatment film, and said one or more water-containing material holders are disposed so as for the water-containing material to be in contact with the one damaged portion or the damaged portions; and supplying a current between the one electrode and the metal base (2, 3), or between at least one of the electrodes and at least one of the other electrodes, as an anode and a cathode, respectively from a current supplier provided on the external circuit to bring corrosion of the coated metal material to progress, wherein the water-containing material has a viscosity at 65°C of 10 mPa·s or more to 40 mPa·s or less, preferably 20 mPa·s or more to 40 mPa·s or less, wherein the water-containing material comprises water, an electrolyte material and a thickener, wherein the thickener is a polyether polyol-based urethane polymer, wherein the content of the polyether polyol-based urethane polymer in the water-containing material is 4.0 mass% or more to 15.5 mass% or less; wherein the step of bringing corrosion of the coated metal material to progress includes causing expansion of the surface treatment film to occur and progress, wherein the use of the water-containing material having the viscosity in the above-described range makes hydrogen which is generated in the contact portion between the water-containing material and the metal base (2, 3) be retained between the surface treatment film and the metal base (2, 3) and makes the internal pressure between the surface treatment film and the metal base (2, 3) increase, which accelerates lifting of the surface treatment film.