To provide a water softening apparatus that can prevent subsequent dripping in which hot water leaks from a hot water terminal after closure of a hot water mixing stopper without intention.

A water softening apparatus 1 includes a water softening vessel 2, a hot water introduction part 10 is disposed at an upper part of the water softening vessel 2, and a softening water discharge part 11 is disposed at a lower part of the same. Moreover, a charging part 5 in which an ion exchange resin is charged and a closed space V locating between the charging part 5 and the hot water introduction part 10 are disposed in an inside of the water softening vessel 2. In addition, a communication passage 7 that communicates the closed space V and the softening water discharge part 11 is disposed, and air in the closed space V can be discharged through the communication passage 7.