Patent ID: 7513602

Claim:
A coating method for forming a coat on a base material having at least one through-hole, the through-hole having an inner surface between one end and the other end thereof, the coat being formed on at least a predetermined partial region of the inner surface of the through-hole, the partial region of the inner surface running a predetermined length from the one end of the through-hole toward the other end, the method comprising the steps of: forming a coat preform to be processed into the coat on a region including the partial region of the inner surface of the through-hole; attaching a sheet material for protecting the coat preform to one surface of the base material in which the one end of the through-hole is provided so that a part of the sheet material is packed into the through-hole to cover the coat preform provided on a region of the inner surface of the through-hole which includes the predetermined partial region; subjecting the base material to plasma processing and/or ultraviolet ray irradiating processing from the side of the base material where the other end of the through-hole is provided to remove the coat preform exposed from the sheet material while removing the sheet material which covers the coat preform other than the partial region by the plasma and/or ultraviolet ray irradiating processing and leaving the coat preform on the predetermined partial region as it is; and removing the sheet material from the base material by peeling off the sheet material from the base material.