An image reading device includes a light source, an imaging unit that captures an image of an original using light from the light source, a conveying unit that conveys the original to the imaging unit, a casing that accommodates at least the imaging unit and the conveying unit, the casing having an insertion slot for feeding the original to the conveying unit, a determination unit that determines whether or not the image reading device is in a conveyable state in which the conveying unit is enabled to convey the original toward the imaging unit, and a notification unit that visually indicates whether or not the image reading device is in an insertion-enabled state enabling the original to be inserted through the insertion slot to the conveying unit based on determination made by the determination unit.The notification unit is provided above and near the insertion slot outside the casing or inside the insertion slot and between boundary planes, and the boundary planes contain respective opposite horizontal ends of the insertion slot and are perpendicular to a horizontal direction of the insertion slot with the casing being in a placed state.