To provide a washing/drying machine and a drying machine capable of indicating clogging of a filter without fail even when laundry (a drying target) is dried without using a heater.

A water level sensor 24b detects an air pressure within an air trap 24a. The air trap 24a is connected to a water tank 2 corresponding to a part of a circulation air path through which drying air sent from an air blower 70 in a drying operation circulates. A CPU of an operation control unit 8 indicates clogging of a filter 71 if the water level sensor 24b detects an air pressure exceeding a reference pressure continuously prescribed times or more during a drying operation.