To provide a working booth which can uniformly supply air over the entire working space.

The working booth 10 is formed of: a latticed main body 10a which is constructed on a floor surface F for forming the working space 10w partitioned from the peripheral area; an air supply device for supplying air into the working space 10w; gaps S defined by the latticed main body 10a and the floor surface F, for discharging air in the working space 10w; and opening/closing members 1 each for partially changing an opening area of the gap S. Further in order to lead air from the working space 10w via the gaps S, the working booth 10 is composed of: exhaust ducts 2 communicating with the gaps S; and a latticed sub-body as a venting passage for supplying air flowing in the exhaust ducts 2, to the air supply device. Furthermore the exhaust duct 2 has a valve member 3 each discharging air only in a direction outside the latticed main body 10a and the latticed sub-body.