To provide a blind using a Peltier element bodies and a building wall capable of generating a comfortable temperature environment on the indoor side by properly controlling influence of solar radiation heat.

In this blind 1 using the Peltier element body, at least a part is formed of the Peltier element body 2, at least a part is formed of a solar battery panel 3, and the solar battery panel can be connected as an electric current supply source 19 flowing to the Peltier element body. The Peltier element body can effectively prevent an entrance of solar radiation into the indoor side at the window, and can transfer desired heat between the obverse side and the reverse side of the blind by the Peltier action.