A washing machine includes a main body, a drum disposed within the main body, an air supply duct disposed so as to be communicated with the drum, and supplying hot air to the inside of the drum, a first exhaust duct communicated with the drum so as to exhaust the hot air from the drum, a second exhaust duct to guide the hot air exhausted from the drum to the outside of the main body, a filter case provided with a hot air introduction hole connected to the first exhaust duct and a hot air exhaust hole connected to the second exhaust duct, a water storage chamber provided within the filter case, and a hot air flow chamber provided within the filter case and communicated with the water storage chamber.