An image forming apparatus of the present invention includes an apparatus body, an image carrier (20) for carrying a latent image on its surface, and a developing device (50,51) for developing the latent image to thereby produce a corresponding toner image. A removable member (10,11) is removably mounted to the apparatus body and positioned in the apparatus body such that a distance between the removable member (11) and a surrounding member (20) around it varies when the removable member is being mounted to or dismounted from the apparatus body. A frame (17) surrounds at least one of the removable member (10) and surrounding member. A contact member (56) contacts, when the removable member (10) is being mounted to or dismounted from the apparatus body, the frame (17) to thereby determine a distance between the removable member (11) and the surrounding member (20).