Separator of a fuel cell and a manufacturing method thereof

A separator (10) of a fuel cell includes a base material (11) and a surface treatment layer (12) formed on the base material (11). The surface treatment layer (12) includes a base material-side portion (12a) made from metal and a base material opposite-side portion (12b) made from carbon formed at an atom level or composite materials of carbon and metal or semi-metal. The surface treatment layer (12) may further include carbon particle composite layer (16) formed on the base material opposite-side portion (12b) formed at an atom level. In a manufacturing method of the above separator (10) of a fuel cell, the base material opposite-side portion (12b) is formed by dry coating.