Nitrogen-containing porous carbon material and method of producing the same, and electric double-layer capacitor using the nitrogen-containing porous carbon material

A nitrogen-containing carbon porous material, comprising nitrogen at a content of 0.5 to 30 mass %, wherein the nitrogen-containing porous material has a specific surface area of 1,015 to 2,200 m2/g and contains oxygen at a content of 8.7 to 11.4 mass %,

• wherein the nitrogen-containing carbon porous material is obtained by mixing and heating a melamine and magnesium citrate to form a carbon film containing the nitrogen on a carbon skeleton at a circumference of a particle of MgO formed by oxidation of Mg in the magnesium citrate upon heating, and then removing the MgO.