A washing device for parts of human body being such as anus or private part of female is disclosed. Such washing device is substantially characterized in that the heated-water supply source and the cold-water supply source which are connected with a heated-and-cold-water mixing valve respectively are both installed outside of a toilet chamber or a bathroom and a mixed-water ejecting nozzle is connected to a downstream end of a mixed-water supply passage which has an upper end thereof connected to an outlet opening of the heated-and-cold-water mixing valve. Due to such construction, the washing deivce can extremely improve the heating efficiency so as to enable the considerable energy saving and can unnecessitate the installation of the heat exchangers in the washing device so as to make full use of a narrow space of a toilet chamber or a bathroom.