To provide a surface treated magnesium material obtained by providing the surface of a magnesium material in which the stock is composed of magnesium or a magnesium alloy with a coating film layer exhibiting excellent adhesion of a coating film, corrosion resistance, impact resistance and workability and furthermore exhibiting excellent coating film hardness and to provide a method for producing the surface treated magnesium material having the same characteristics.

This surface treated magnesium material has a roughened surface with a surface roughness Rz of 3 to 50 μm deposited on the surface of a magnesium material consisting of magnesium or a magnesium alloy, a film layer deposited on the whole face of the surface of the magnesium material inclusive of the roughened surface by chemical conversion treatment or anodic oxidation treatment and a coating film layer provided as an outermost layer, moreover, the method produces the same surface treated magnesium material, and the material exhibits excellent adhesion of a coating film, corrosion resistance, impact resistance and workability and furthermore exhibits excellent coating film hardness.