Image Reading Apparatus

An image reading apparatus comprising:

• a main body having an opening in an upper face side thereof;
• and
• a reading unit that is mounted on the main body and is configured to move between a close position in which the opening is closed and an open position in which the opening is opened;
• wherein the reading unit comprises:
• a document table;
• a lower supporting member that supports the document table from below;
• an upper supporting member that is in contact with an upper side of the document table and clamps the document table with the lower supporting member;
• and
• a reading device that is arranged between the document table and the lower supporting member and is configured to read an image of a document placed on the document table,
• wherein the main body comprises:
• an exterior member arranged in a position adjacent to the upper supporting member in a case where the reading unit is moved to the close position,
• wherein one of the upper supporting member and the exterior member comprises an abutting portion and the other of the upper supporting member and the exterior member comprises an abutted portion, which the abutting portion is configured to be placed in direct abutment against in the case where the reading unit is moved to the close position, so as to configure a positioning mechanism, and
• wherein the positioning mechanism is configured to establish positioning of a relative position between the upper supporting member and the exterior member in an up-down direction.