A rotary developing device 30 is provided in an image forming device that is rotated by an input gear 46. The rotary developing device 30 has a plurality of developing units 13, a frame 28, and a rotation stop mechanism 50. Each of the plurality of developing units 13 house toner of one of the colors, and develops at a predetermined developing position. The frame 28 includes a support portion 36 that supports the plurality of developing units 13 and has a rotation shaft, and a ring shaped gear 29 that is rotated by the input gear 46. The rotation stop mechanism 50 stops the rotation of the frame 28 at the developing position. Also, the number of gear teeth in the ring shaped gear 29 is the number of gear teeth in the input gear 46 multiplied by the number of developers.

 
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> Image-forming apparatus including a device to attach and detach a transfer roller from a main body frame thereof

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