Coating method, liquid supplying head and liquid supplying apparatus

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;
• 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 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.