Patent ID: 8199382

Claim:
An image reading device comprising: a document mounting plate comprising a mounting surface having a first side and a second side perpendicular to the first side, and a rear surface opposite the mounting surface and configured to receive a document to be mounted; and an image reading unit extending in a direction along the first side of the mounting surface, and the image reading unit comprising: a photoelectric converter positioned to face the rear surface, and configured to read an image on the document; a case configured to hold the photoelectric converter, the case extending along the first side of the mounting surface; a first rotating member, a second rotating member, a third rotating member and a fourth rotating member, the first and second rotating members being positioned at a first end portion of the case and the third and fourth rotating members being positioned at a second end portion of the case opposite to the first end portion in a longitudinal direction thereof, and the first, second, third and fourth rotating members being configured to rotate as the image reading unit moves, and the first, second, third and fourth rotating members being configured to receive a pressing force from the rear surface of the document mounting plate as the image reading unit moves; a holder configured to support the case; and a first urging device and a second urging device each of which is positioned between the holder and the case, the first urging device and the second urging device being configured to urge the case toward the rear surface, the first urging device being positioned on a first line connecting the first and second rotating members as viewed from a direction perpendicular to the mounting surface, and the second urging device being positioned on a second line connecting the third and fourth rotating members as viewed from the direction perpendicular to the mounting surface, wherein no urging device is positioned between the first line and the second line as viewed from the direction perpendicular to the mounting surface.