Image forming apparatus

An image forming apparatus provided with a photosensitive unit that has a photosensitive body and an exposure device that exposes the photosensitive body, comprising;

• an apparatus main body that has an opening on its surface, having a rotation supporting point;
• a first rotating member that holds the exposure device and is rotatably supported by the rotation supporting point of the apparatus main body such that the first rotating member opens or closes the opening of the apparatus main body by swinging around the rotation supporting point;
• a second rotating member that is arranged between the apparatus main body and the first rotating member and is rotatably supported by the rotation supporting point of the apparatus main body;
• a photosensitive unit holding member that holds the photosensitive unit and is slidably supported by the second rotating member;
• a first engagement part that is provided in the first rotating member and engages with the photosensitive unit holding member;
• and
• a second engagement part that is provided in the photosensitive unit holding member and engages with the apparatus main body, wherein
• when the first rotating member and the photosensitive unit holding member are engaged with each other by the first engagement part, and engagement between the photosensitive unit holding member and the apparatus main body is released by the second engagement part, the first rotating member integrally rotates with the second rotating member to open the opening and to separate the photosensitive unit from the apparatus main body, and
• when engagement between the first rotating member and the photosensitive unit holding member is released by the first engagement part and the photosensitive unit holding member and the apparatus main body are engaged with each other by the second engagement part, the first rotating member rotates to separate the exposure device from the photosensitive unit.