Image reading device

An image reading device comprising:

• a light guide extending in a main scanning direction and configured to emit light to an object to be read,
• a lens body to focus reflected light reflected by the object to be read;
• a light receiver to receive the reflected light focused by the lens body;
• a sensor board on which the light receiver is mounted,
• lens holders on which the light guide, the lens body, and the sensor board are mounted;
• and
• a housing to house or hold the light guide, the lens body, the sensor board, and the lens holders,
• wherein
• the lens holders are disposed at both ends of the housing in the mam scanning direction and each includes elude a holder bottom, a light guide positioner, and lens body holders,
• the lens body is mounted on pairs of the lens body holders, each pair being provided upwards from the corresponding holder bottom toward the object to be read and extending in the main scanning direction,
• the sensor board is mounted on the holder bottoms such that the light receiver aligns with an optical axis of the lens body,
• the light guide is attached to the light guide positioners, the light guide positioners each comprising the lens body holder and a holder bottom protrusion continuous with the lens body holder and protruding in a sub-scanning direction from an intersection of the holder bottom with the lens body holder, and
• a surface of each light guide positioner that faces the light guide to be attached has at least a portion having a same shape as a shape of a surface of the light guide.