To provide a bag-filter type small deodorizing and dust collecting apparatus where deodorization of a casting factory or the like, mainly, particularly, the local deodorization thereof is made possible, and, while performing dust collection, circulation, supply and discharge of activated carbon used therefor can be performed without the need of a large-scale device.

The bag-filter type small deodorizing and dust collecting apparatus includes a feed pipe 7 feeding deodorizing powder P, a rotary valve 8 discharging the deodorizing powder P by a fixed amount, a reflux pipe 9 for refluxing the deodorizing powder P from the rotary valve 8, and a blower 10 refluxing the deodorizing powder P, and comprises a switch-over gate 11 mounted on a discharge side of the rotary valve 8, branch pipes 12, 13 connected to the switch-over gate 11, in which the branch pipe 12 is connected to a discharging chamber 14 and the other branch pipe 13 is connected to the reflux pipe 9.