NOVELTY - Bias voltage is applied on base material. An arc discharge is performed in atmospheric gas, and atmospheric gas containing carbon-containing gas and noble gas as main components is supplied. The cathode substance comprised in metallic element is evaporated, and ion and/or radical is formed. The ion and radical are supplied on base material by orthogonally crossing to surface at which cathode substance is evaporated, and forming radiation or line of magnetic force. A carbon film containing metallic element is formed on base material.    USE - Formation of metal-containing carbon film used for forming corrosion-resistant film (claimed) for fuel cell separator. Uses include but are not limited to polymer electrolyte fuel cell, alkali electrolyte-type fuel cell, phosphoric acid fuel cell, molten carbonate-type fuel cell, solid oxide fuel cell, and bio-fuel cell used as power supply for electric vehicle, domestic cogeneration system, mobile telephone and personal computer.    ADVANTAGE - The metal-containing carbon film provides corrosion-resistant film with low contact resistance for long period of time.    DETAILED DESCRIPTION - Bias voltage of -50 V to -300 V is applied on a base material consisting of titanium or titanium alloy. An arc discharge is performed in atmospheric gas, and atmospheric gas containing carbon-containing gas and noble gas as main components is supplied. The flow ratio of carbon-containing gas with respect to noble gas is 1/3-2. The cathode substance comprised in metallic element is evaporated, and at least one of ion and radical is formed from each evaporated cathode substance and carbon-containing gas. The ion and radical are supplied on base material by orthogonally crossing to surface at which cathode substance is evaporated, and forming radiation or line of magnetic force which advances in parallel and retains in base material vicinity by magnetic field forming unit (3). A carbon film containing metallic element is formed on base material. The metallic element is chosen from titanium, niobium, zirconium, hafnium and tantalum. The amount (atomic%) of metallic element is less than 2/3 times of carbon content in base material. An INDEPENDENT CLAIM is included for formation of corrosion-resistant film.    DESCRIPTION OF DRAWING(S) - The drawing shows the sectional view of arc-type evaporation source. (Drawing includes non-English language text)    Arc-type evaporation source (1)    Evaporation source (2)    Magnetic field forming unit (3)