Valve device

A valve device comprising:

• a casing having an outflow port in which a fluid outlet opening in a first direction is formed;
• a joint joined to an opening end surface of said outlet in said outflow port;
• a valve accommodated in said casing so as to be rotatable or slidable and in which a communication port that can communicate with said outlet is formed;
• and
• a sliding ring that has a sliding surface for sliding on an outer surface of said valve while being accommodated in said outflow port and communicates said outlet and said communication port in accordance with a rotating position or a sliding position of said valve,
• wherein at least said outer surface of said valve comprises a first resin material that contains a first resin as a main component,
• at least said sliding surface of said sliding ring comprises a second resin material that contains a second resin as a main component, and
• said first resin and said second resin are the same type of resin.