In an engine valve comprising a valve body of an iron base material, a Stellite or similar alloy is clad on the body using a laser beam with a sufficient energy to form a cladding layer as a valve face such that the iron from the body-forming iron base material is diffused into the cladding layer throughout its thickness through an interface layer between the cladding layer and the valve body, whereby the cladding layer has 5 to 15 wt % of iron diffused and the interface layer has an iron content continuously decreasing from the iron content of the body-forming iron base material to that of the cladding layer.