To provide a gas cleaning apparatus which does not require the attachment and detachment of piping when the apparatus is installed and removed and which is easily moved and started to be operated.

A new polyterephthalate(PET) bottle of mineral water is opened and inserted in a holding means 21 in an inverted state. A vacant PET bottle 13 is placed on a supporting table 24 and a drain pipe 23 is inserted into the mouth. Water is supplied to the center side of a rotary member 16 via a pipe line 14 from a drip vessel 28. Dust or malodor is removed from air by bringing air driven by an exhaust fan 18 into contact with a waterdrop moving form the center side to the peripheral side in the structure of rotary member 16 in a process that the air is passed through the rotary member 16 from the lower side to the upper side.