The bag-filter type small deodorizing and dust collecting apparatus including a feed pipe feeding deodorizing powder, a rotary valve discharging the deodorizing powder by a fixed amount, and a reflux pipe for refluxing the deodorizing powder from the rotary valve A blower is provided for refluxing the deodorizing powder. Furthermore a switchover gate is mounted on a discharge side of the rotary valve. Branch pipes are connected to the switchover gate, such that one branch pipe is connected to a discharging chamber and the other branch pipe is connected to the reflux pipe. Dust is collected while enabling deodorization, or in particular, enabling local deodorization of a foundry or the like, mainly, without a need for a large-scaled apparatus for circulation, supply and discharge of the activated carbon or the like used therein.