Image reading apparatus

An image reading device (100) is provided with: a plurality of light receiving units (70) which are regularly arranged; a first light-shielding member (11) including a plurality of first openings (31) arranged so as to correspond to the plurality of light-receiving units (70), respectively; and a plurality of microlenses (14) arranged so as to correspond to each of the plurality of first openings (31). Each of the plurality of light receiving units (70) includes a plurality of light receiving pixels (80) arranged in a first direction, which is a main scanning direction. Each of the plurality of microlenses (14) is telecentric on the object side. The plurality of microlenses (14), the first light-shielding member (11), and the plurality of light-receiving units (70) are disposed such that light reflected by the object (6) and passed through the microlenses (14) and the first openings (31) corresponding to the microlenses (14) is incident on the plurality of light-receiving pixels (80) included in the light-rec