An image reading device comprising: - a light guide extending in a main-scanning direction and a sub-scanning direction; - a first light source, provided at an end portion of the light guide, in which light sources are arranged in an array along the main-scanning direction, for emitting light having a plurality of wave lengths in the sub-scanning direction into the light guide; - a second light source, provided at an end portion of the light guide, in which light sources are arranged in an array in the main-scanning direction along the arrangement of the first light source, for emitting light having a plurality of wave lengths in the sub-scanning direction into the light guide; - a first total reflection face, formed at a position where optical axes of the first light source intersect with the light guide, for totally reflecting light emitted from the first light source in the sub-scanning direction to a portion to be irradiated with light, for a target to be light-irradiated, - a second total reflection face having a slant angle different from that of the first total reflection face, formed at a position where optical axes of the second light source intersect with the light guide, for totally reflecting light emitted from the second light source in the sub-scanning direction to the portion to be irradiated with light; - a lens assembly (9, 11) for focusing reflection light reflected by a reflective portion of the target positioned at the portion to be light-irradiated; and - a sensor for receiving light focused by the lens assembly (9, 11), the portion to be light-irradiated being irradiated with light from the first total reflection face and the second total reflection face by their irradiation angles different from each other, characterized in that - the first light source and the second light source are arranged in parallel with each other on a face perpendicular to the conveying direction of a target; and - the first total reflection face and the second total reflection face having normal lines, and the normal lines are configured to cross at points different from each other on an optical axis of the lens assembly (9, 11) through a focusing light pass. - a light guide extending in a main-scanning direction and a sub-scanning direction; - a first light source, provided at an end portion of the light guide, in which light sources are arranged in an array along the main-scanning direction, for emitting light having a plurality of wave lengths in the sub-scanning direction into the light guide; - a second light source, provided at an end portion of the light guide, in which light sources are arranged in an array in the main-scanning direction along the arrangement of the first light source, for emitting light having a plurality of wave lengths in the sub-scanning direction into the light guide; - a first total reflection face, formed at a position where optical axes of the first light source intersect with the light guide, for totally reflecting light emitted from the first light source in the sub-scanning direction to a portion to be irradiated with light, for a target to be light-irradiated, - a second total reflection face having a slant angle different from that of the first total reflection face, formed at a position where optical axes of the second light source intersect with the light guide, for totally reflecting light emitted from the second light source in the sub-scanning direction to the portion to be irradiated with light; - a lens assembly (9, 11) for focusing reflection light reflected by a reflective portion of the target positioned at the portion to be light-irradiated; and - a sensor for receiving light focused by the lens assembly (9, 11), the portion to be light-irradiated being irradiated with light from the first total reflection face and the second total reflection face by their irradiation angles different from each other, characterized in that - the first light source and the second light source are arranged in parallel with each other on a face perpendicular to the conveying direction of a target; and - the first total reflection face and the second total reflection face having normal lines, and the normal lines are configured to cross at points different from each other on an optical axis of the lens assembly (9, 11) through a focusing light pass.