To provide a small-scale aggregate of a wind power generation device capable of obtaining sufficient generated power.

This aggregate of the wind power generation device is constituted in such a way that it is composed of a support column installed rotatably on the surface of the earth or a base moored on the surface of the earth and the wind power generation devices arranged symmetrically relative to each other on both sides of the support column and each of the wind power generation devices includes a cylindrical duct whose wall body cross section is streamlined from a front end part to a rear end part, a cylindrical vessel fixed by a columnlike member erected from the inner wall surface of the duct, extending along a central axis of the duct, and storing a rotary shaft and a generator, and an impeller connected with the front end part of the rotary shaft.