To improve working environment while suppressing installation costs of a temperature adjusting means.

In this air circulating system wherein the air from a cleaning chamber 30 is led out to the external, and then introduced into the cleaning chamber 30 again, an air shower unit 60 is disposed to remove dust from the air introduced into the cleaning chamber 30, on the other hand, a dust removing device 50 is disposed to deliver the air from a working chamber 10 to the external and remove the dust from the air delivered to the external, and the air is guided to the working chamber 10 from the cleaning chamber 30 through a front chamber 20 by driving the dust removing device 50, an evaporator 85 of a heat pump 80 for adjusting a temperature of the air passing through a circulation passage, is disposed in the circulation passage of the air formed by the air shower unit 60.