To provide a development processor for deodorizing the installation place, and to provide a method of supplying a decomposition substance in it.

The development processor 10 comprises: a developing part 14 for performing development processing on a film F. The developing part 14 comprises: a plurality of processing tanks 22 provided in a casing 20 of the developing part 14; an exhaust part 46 for exhausting odor gas generated from processing liquid in the processing tank from the casing 20; and a supply part 48 for supplying ozone generated by an ozone generator 56 to the exhaust part 46. When the development processor 10 is in a processing state, an arrangement member 58 arranging the ozone generator 56 is arranged in a recess 60 of the casing 20. When the development processor 10 is in a stop state, the arrangement member 58 is out of the recess 60.

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