To provide a development processor capable of reducing excessive ozone with simple and low-cost constitution.

The development processor 10 includes a development section 14 which develops a film F and a controller 18 for controlling respective components of the development processor 10. The development section 14 is provided with a plurality of processing tanks 24 filled with different kinds of processing liquid, and an exhaust section 40 for discharging odor gas produced from the processing liquid after decomposing/deodorizing it with ozone. A CPU 18a of the controller 18 places an ozone producer 44 in operation in normal mode or low-production mode based upon the driving state of a conveyance rack 30 conveying a film F in processing liquid of the processing tanks 24 in a dipped state.

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