An air deodorizing and sterilizing device (1) which is compact and safe to use comprises a plurality of catalyst members (12) each having throughholes (7) and disposed with gaps between each other, a cover (20) for tightly sealing the periphery of the gaps between each of the opposing surfaces of the adjacent catalyst members and electrodes (14, 15) disposed on the opposing surfaces of the catalyst members for applying a high voltage. In a further modified device the catalyst members are made of material having electroconductivity substantially identical with that of the electrodes, so that a corona discharge is produced in the througholes of the catalyst members as well as between the electrodes. The deodorizing and sterilizing functions can be maintained for a long period of time. <IMAGE>
