Drum type drying and washing machine

A drum type washing and drying machine has a water tank, a rotary drum rotatably provided in the water tank, a dehumidifying heat exchanger for dehumidifying air introduced from inside of the rotary drum, a heater unit for heating the air dehumidified by the dehumidifying heat exchanger, and a blower for introducing the air in the rotary drum into the dehumidifying heat exchanger and delivering into the rotary drum the air heated by the heater unit. A filter is placed in a suction-side channel between the rotary drum and the blower and on an upstream side of air flow produced by the blower in a drying process. The filter is placed so as to be soaked in water supplied into the water tank in a washing process or in a rinsing process.