Image reading device

An image reading device, comprising:

• a plurality of lens arrays arranged in a main scanning direction and each including a plurality of lens bodies arranged in the main scanning direction, each two adjacent lens arrays of the plurality of lens arrays being arranged with a gap therebetween;
• an image sensor to receive light converged by the plurality of lens bodies;
• and
• a plurality of slit portions arranged between the plurality of lens arrays and the image sensor in the main scanning direction, one or more slit portions of the plurality of slit portions being provided for one lens array of the plurality of lens arrays, the plurality of slit portions including a second slit portion that is a slit portion that includes first light shielding plates and a second light shielding plate, and including a first slit portion that is a slit portion that includes only the first light shielding plates in a case where more than one slit portions of the plurality of slit portions are provided for one lens array of the plurality of lens arrays, the first light shielding plates each separating an optical path of light passed through one lens body of the plurality of lens bodies from another optical path of light passed through an adjacent lens body of the plurality of lens bodies, the second light shielding plate restricting an optical path of light passed through a lens body of the plurality of lens bodies closest to the gap at a gap side in the main scanning direction and of which a position in a direction along the optical path at an image sensor side is closer to the plurality of lens arrays than the first light shielding plates are, so that a field of view of the lens body closest to the gap representing a spread of the restricted optical path overlaps, on a surface of the image sensor facing the plurality of lens arrays, a field of view of an adjacent lens body adjacent, with the gap therebetween, to the lens body closest to the gap of the plurality of lens bodies.