To provide a wind generating device for a wind tunnel wherein occurrence of abnormality is automatically detected for safe stop.

A high-pressure air 10 at normal temperature filled in a high- temperature air-storage tank 1 is depressurized to a specified value by a pressure-regulating valve 2, and then heated to a specified temperature by a heater 3 to obtain a high-temperature high-pressure air 10', which is introduced from a high-temperature shielding valve 5 to a nozzle 6, for generating an air current in a wind tunnel. The normal-temperature high-pressure air 10 is applied to a slide part of a valve rod plug part of the high-temperature shielding valve 5 as a seal air. A pressure transfer device 7 detects a pressure of the normal-temperature high-pressure air 10 flowing in a supply piping. A pressure transfer device 8 detects a seal air pressure. A wind tunnel control device 4 receives a pressure value from the pressure transfer channels 7 and 8, and, based on calculation, controls closing operation of the pressure regulating valve 2 and the high-temperature shielding valve 5.