To provide an electrophotographic image forming apparatus suitably carrying out detection of an environment around each developer becoming a control factor when controlling the developing condition of each developing device in an image forming apparatus provided with a plurality of developing devices.
The electrophotographic image forming apparatus provided with the plurality of developing devices for developing an electrostatic latent image formed on a photoreceptor drum with the developer is provided with: humidity sensor units 14a and 14b installed in at least two pieces of the developing devices 4Y and 4K among the plurality of developing devices 4Y, 4M, 4C and 4K; and a control means controlling image forming conditions according to the detection results.
Hiroyuki Nakagawa
Sorimachi Yukiyoshi
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