Image forming apparatus

An image forming apparatus, comprising:

• a main body;
• a cover configured to cover an upper part of the main body;
• and
• an upper unit arranged in an upper position with respect to the cover,
• wherein the cover comprises a stackable surface, on which a sheet having the image formed thereon by an image forming unit and being ejected out of the main body is placed, and an attachment section formed to extend upward from the stackable surface and to have an inner wall surface, on an upper side thereof, the inner wall surface of the attachment section adjoining the stackable surface and rising upward from the stackable surface,
• wherein the upper unit comprises a base surface and an attachable section on a bottom plane thereof, the base surface being arranged to spread over the stackable surface with a predetermined amount of a gap reserved between the base surface and the stackable surface, and the attachable section being arranged in a position to adjoin the base surface to face a top surface of the attachment section and being configured to be attached to the attachment section,
• wherein the attachment section is formed to have a downward dent on the top surface thereof, the downward dent being positioned to adjoin a boundary part, the boundary part being a part of a gap formed in a position between the top surface of the attachment section and a bottom surface of the attachable section, and
• wherein the downward dent is a groove elongated in parallel with the boundary part.