Patent ID: 8289587

Claim:
An image reading apparatus for reading a document placed on a document positioning plate, comprising: a carriage movable along a first direction, the carriage having a shape extending along a second direction perpendicular to the first direction between a first side and a second side; a reading sensor unit mounted on the carriage, the reading sensor unit having a shape extending along the second direction; a driving unit having a motor for moving the carriage along the first direction; an urging member disposed between the carriage and the reading sensor unit, wherein the urging member is disposed at the first side and is not disposed at the second side; and a guide rail provided in an apparatus body and guiding movement of the carriage, wherein the carriage has a guide portion provided between the first side and the second side and engaged with the guide rail, and wherein the guide portion is pressed toward the guide rail by receiving a reaction force of the urging member, the urging member urges the reading sensor unit at the first side toward the document positioning plate, and the carriage urged by the reaction force urges the reading sensor unit at the second side toward the document positioning plate.