Image reading apparatus and image forming apparatus

An image forming apparatus comprising:

• a circuit board on which a plurality of light sources are disposed in a longitudinal direction;
• a light guide portion configured to guide light emitted from the plurality of light sources, the light guide portion including a first holding portion configured to hold the circuit board, and a second holding portion configured to hold the circuit board, the second holding portion being disposed at a position different from the first holding portion in the longitudinal direction;
• a support member configured to support the light guide portion;
• an image reading unit configured to read image information by performing photoelectric conversion on reflected light reflected by a sheet which has received light emitted from the light guide portion;
• and
• an image forming unit configured to form an image on a sheet,
• wherein the support member includes a projecting portion disposed between the first holding portion and the second holding portion in the longitudinal direction, the projection portion facing and projecting toward the circuit board held by the first holding portion and the second holding portion.