Image forming apparatus

An image forming apparatus comprising:

• a housing;
• a fixed component affixed to the housing;
• a writing unit attachable to and detachable from the housing;
• a waste toner bottle attachable to and detachable from the housing;
• and
• a guide to guide the writing unit when the writing unit is attached to or detached from the housing, the guide including a first guide portion inclined downward to guide the writing unit such that the writing unit moves downward in a direction in which the writing unit is detached from the housing,
• wherein the writing unit includes a positioning portion that protrudes in a direction in which the writing unit is attached to the housing,
• wherein the housing includes a unit positioner that engages with the positioning portion of the writing unit at a position above the guide to position the writing unit,
• wherein the guide includes a second guide portion that extends from an upper end of the first guide portion toward a side of the housing in which the unit positioner is disposed;
• wherein the guide includes a third guide portion to guide said waste toner bottle when said waste toner bottle is attached or detached, and
• wherein said waste toner bottle is attachable or detachable in a direction orthogonal to the direction in which the writing unit is attached to or detached from the housing.