To provide a fume hood capable of smoothly discharging a relatively light gas and a relatively heavy gas in a treating chamber to the outside and exhibiting an excellent confining function while suppressing an amount of conditioning air sucked from a front opening part and suppressing generation of whirlpool at the peripheral part side of the front opening part of the treating chamber.

The fume hood main body 22 provided with air feed passages L1, L2, L3 connected with an air feed fan 53 can arbitrarily form an air flow A1 of an air curtain fed from the front opening part 24 to the treating chamber 23 over the surface 29a of a lifting sash window 29, a side laminar flow A2 fed from individual gaps t provided by a partition chamber 33 toward a baffle plate 63 along the individual light and left side plate parts 26, and a horizontal laminar flow A3 fed in a horizontal direction of a treating table part 27 through the blowing opening 44 of an air blowing part 43, simultaneously.