Image reading apparatus and image forming apparatus

An image forming apparatus comprising:

• a plurality of light emitting elements configured to emit light;
• a circuit board including a first circuit surface on which the plurality of light emitting elements is arranged in a first direction and a first recessed portion recessed in a second direction intersecting with the first direction in parallel with the first circuit surface;
• a light guide configured to guide light, emitted from the plurality of light emitting elements, to a sheet;
• and
• an image reading device configured to read an image on the sheet based on light reflected from the sheet;
• an image forming unit configured to form image on a sheet based on the image read by the image reading device,
• wherein the light guide includes a first surface facing the first circuit surface, and a positioning portion provided at a position corresponding to the first recessed portion in the first direction and extending from the first surface in a third direction intersecting with the first direction and the second direction and configured to position the circuit board in the first direction with respect to the light guide member in a state in which the positioning portion enters the first recessed portion, and
• wherein the light guide includes a second surface facing a second circuit surface of the circuit board opposite to the first circuit surface, and the second surface extends from the positioning portion in the second direction.