To provide a slide type valve device stable excellent in water stopping and operability over a long time, by continuously supplying a solid lubricant layer difficult to flow out in a fluid of hot/cold water or the like to a slide surface of a valve element and a valve seat.

In a valve device opening/closing a valve hole 6 by piling together a ceramic-made valve element 7 in a ceramic-made valve seat 5 and sliding the valve element 7 relating to the valve seat 5, in at least one of slide surfaces of the valve seat 5 and the valve element 7, a groove 17 is formed, in the inside thereof, a water absorbing high polymer material layer a or elastic material of rubber, spring, etc., is received, also a solid lubricant layer is received so as to conform to a groove opening part, by expansion force in the case of the water absorbing high polymer material layer absorbing water or by elastic force of the elastic material, the solid lubricant layer is brought into press contact with the slide surface of the valve seat 5, to this slide surface, the solid lubricant layer difficult to flow out in hot/cold water or the like is continuously supplied.