An image forming device includes a swing body attached to a main body swingably around a first axis between a first state away from the main body and a second state close to the main body, an arm having a first end attached to one of the main body and the swing body swingably around a second axis parallel to the first axis and a second end joined with a second one of the two bodies slidably to be close to or away from the first axis, and a pressing member provided to the second one of the two bodies to press the arm toward the second axis in the second state. The second end includes a contact surface to contact the pressing member that is parallel to the second axis and slanted relative to a virtual plane perpendicular to an axial line of the arm.