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PROBLEM TO BE SOLVED: To provide a temperature responsive valve easy to manufacture as a micro valve which can open/close or switch a flow path, is driven at a small temperature difference and is used for a micro fluid device, and to provide its manufacturing method. ; SOLUTION: The valve comprises the fine flow path, and a valve element arranged in the fine flow path for opening/closing the fine flow path, switching it or controlling its flow amount. The valve element is formed of a joint body consisting of a temperature responsive gel having a gel-solid transition temperature and a flexible member. It is deformed with a temperature change to open/close the fine flow path, switch it or control its flow amount. ; COPYRIGHT: (C)2007,JPO&INPIT