Patent ID: 8724186

Claim:
An image reading device comprising: a document plate having an upper surface on which an original document is placed; a case including a bottom plate, which is a bottom section, and configured to support the document plate; a reading section that is arranged so as to extend in a main scanning direction in the case, can move in a sub-scanning direction in the case, and is configured to read an image of the original document; an engaging section disposed on a surface of the reading section opposed to the bottom plate; a guide section extended in the sub-scanning direction on the bottom plate to be opposed to the engaging section, and configured to engage with the engaging section to thereby guide linear movement of the reading section in the sub-scanning direction; a first deformation characteristic section that is arranged in a first region when the bottom plate is divided into the first region and a second region with the guide section as a boundary, and that has a deformation characteristic such that the first deformation characteristic section deforms with respect to heat in a first direction that is perpendicular to the bottom plate; and a second deformation characteristic section that is arranged in the second region, and that has a deformation characteristic such that the second deformation characteristic section deforms with respect to heat in a second direction which is opposite to the first direction and perpendicular to the bottom plate.