PURPOSE: To provide a surface-treated corrosion resistant copper pipe which decreases dissolution copper and is easy to handle by forming the film of the copper oxide stable in water on at least the inside surface of the copper pipe.

CONSTITUTION: The film of a copper oxide having 0.1W10μm thickness is forcibly formed on at least the inside surface of a copper pipe, i.e., a copper pipe consisting of copper and an alloy consisting essentially of copper. The formation of the copper oxide is executed by the oxidation treatment of, for example, the following formulation: The oxidation treatment is executed under the conditions of 95°C and 1W5min in an aq. soln. consisting of 100g/l NaOH and 15g/l KClO3. As a result, the dissolution of the base metal of the copper pipe is considerably decreased and the need for a water treatment for the purpose of inhibiting corrosion is eliminated; in addition, the need for termination for the purpose of connection is eliminated and joining by brazing is possible. The effect of preventing dissolution of the copper is obtd. even if the copper pipe is connected by the operation similar to the operation in the prior art.