To provide a washing and drying machine which can shorten a washing period of time by making washing water to be supplied into a washing tub effectively penetrate into laundry in a rotary drum right after the starting of water supply.

In the washing and drying machine which comprises: a washing tub 2 supported in an outer casing 1; and a rotary drum 3 which rotates inside of the washing tub 2 on the same axis, a water supply nozzle 54 is provided midway in an introduction duct 61 for introducing dry air inside of the rotary drum 3, and further the water supply nozzle 54 is provided midway of a water supply path of the washing water so as to communicate with the water supply path through an auxiliary water supply pipe 53. At the start of the supply of the washing water, the washing water is supplied into the introduction duct 61 through the auxiliary water supply pipe 53 and the water supply nozzle 54, also transported by induced wind of a blower fan 70 produced by driving the blower fan 70, and is fed inside of the rotary drum 3 through an introduction port 65 provided at the end of the introduction duct 61.