To provide a double running type mixture valve device in a hot water system having several hot water suppliers (applications) in which the number of component parts can be reduced as compared with the case in which several mixture valves are used, and when a check valve for preventing inverse flow (leakage) is arranged, the number of machining and assembling steps and the number of component parts can be reduced.

A tubular water chamber 11 having a water inlet 21 and a tubular hot water chamber 12 are arranged side-by-side and the tubular water chamber 11 and/or the tubular hot water chamber 12 are provided with check valves 80. The check valve 80 comprises a valve seat 82 installed at the tubular water chamber 11 and/or the tubular hot water chamber 12, a valve body 83 moved toward or away from the valve seat 82, a valve rod 85 for holding the valve body 83, a cylindrical guide part 86 into which the valve rod 85 is slidably fitted and inserted and a valve closing spring 88. A lid-like member 70 for closing an end opening of the tubular water chamber 11 and/or the tubular hot water chamber 12 is integrally provided with the cylindrical guide part 86 for the check valve 80 and its supporting part 78.