A water purifier includes a valve comprising a plurality of valves configured to control a direction of water flow; an integrated water way part in which the valve is inserted along one predetermined direction and a plurality of water ways connected with the valves are provided; and a case covering the valve and the integrated water way part, in a state where the valve and the integrated water way are coupled to each other, the case having one side that is open and closed to expose the integrated water way outside.