A surface-treated metal sheet comprising: a metal sheet; and a coating film placed on at least one major surface of the metal sheet, wherein the coating film contains oxide particles, a binder resin, and electrically conductive particles, the amount of the electrically conductive particles contained is 5 to 30 mass% relative to the coating film, the oxide particles comprise non-doped oxide particles and/or doped oxide particles, the non-doped oxide particles comprise at least one kind selected from the group consisting of zinc oxide particles, tin oxide particles, magnesium oxide particles, calcium oxide particles, and strontium oxide particles, the doped oxide particles comprise at least one kind selected from the group consisting of doped zinc oxide particles and doped tin oxide particles, the amount of the oxide particles contained is 1 to 30 mass% relative to the coating film if the oxide particles comprise the doped oxide particles, and is 1 to 10 mass% relative to the coating film if the oxide particles do not comprise the doped oxide particles; wherein the electrically conductive particles comprise two or more kinds of non-oxide ceramic particles and at least one kind selected from the group consisting of iron alloy particles and stainless steel particles, and the mass ratio between the non-oxide ceramic particles and the at least one kind selected from the group consisting of the iron alloy particles and the stainless steel particles (the non-oxide ceramic particles/the at least one kind selected from the group consisting of the iron alloy particles and the stainless steel particles) is 1/9 to 8/2; and the amount of the coating film attached to the major surface is 2 to 20 g/m 2. a metal sheet; and a coating film placed on at least one major surface of the metal sheet, wherein the coating film contains oxide particles, a binder resin, and electrically conductive particles, the amount of the electrically conductive particles contained is 5 to 30 mass% relative to the coating film, the oxide particles comprise non-doped oxide particles and/or doped oxide particles, the non-doped oxide particles comprise at least one kind selected from the group consisting of zinc oxide particles, tin oxide particles, magnesium oxide particles, calcium oxide particles, and strontium oxide particles, the doped oxide particles comprise at least one kind selected from the group consisting of doped zinc oxide particles and doped tin oxide particles, the amount of the oxide particles contained is 1 to 30 mass% relative to the coating film if the oxide particles comprise the doped oxide particles, and is 1 to 10 mass% relative to the coating film if the oxide particles do not comprise the doped oxide particles; wherein the electrically conductive particles comprise two or more kinds of non-oxide ceramic particles and at least one kind selected from the group consisting of iron alloy particles and stainless steel particles, and the mass ratio between the non-oxide ceramic particles and the at least one kind selected from the group consisting of the iron alloy particles and the stainless steel particles (the non-oxide ceramic particles/the at least one kind selected from the group consisting of the iron alloy particles and the stainless steel particles) is 1/9 to 8/2; and the amount of the coating film attached to the major surface is 2 to 20 g/m 2.