To realize a wind tunnel system capable of supplying air current that varies at arbitrary wind direction and wing speed in relation to an object to be measured.

A plurality of domes 11-14 different in diameter and height are disposed on the same axis. A partition plate that comparts each dome along the center axis is disposed at identical angle so as to form a feed back current path. The center section of each dome is divided so that rotor blades 22a-22h pass therethrough. The rotor blade varies the attack angle of a rotary wing in accordance with the rotation angle under control of a cycle pitch control section 26B. Thereby, the air current that varies at arbitrary wind direction and wing speed in relation to the object to be measured can be supplied in a measurement region 16.