Image reading apparatus and image forming system

An image reading apparatus configured to read an image formed by an image forming unit forming the image on a recording material and disposed downstream of the image forming unit in a conveyance direction of the recording material, the image reading apparatus comprising:

• a conveyance unit configured to convey the recording material;
• a first reading unit configured to read the image on a first surface of the recording material from upward in a vertical direction;
• a first guide portion disposed interspatially lower in the vertical direction with respect to the first reading unit and forming a conveyance path of the recording material with the first reading unit;
• a second reading unit configured to read the image on a second surface opposite the first surface of the recording material from downward in the vertical direction;
• and
• a second guide portion disposed interspatially upper in the vertical direction with respect to the second reading unit and forming a conveyance path of the recording material with the second reading unit,
• wherein the second reading unit comprises:
• a rectangular transparent member;
• an optical reading unit configured to read the image by irradiating light onto the second surface of the recording material via the transparent member;
• a housing comprising a facing surface facing the transparent member and accommodating the optical reading unit with the transparent member;
• a first contact portion protruding from the facing surface of the housing and coming into contact with the transparent member on a side of a first end separated from a center in a longitudinal direction of the transparent member;
• a second contact portion protruding from the facing surface of the housing and coming into contact with the transparent member on a side of a second end opposite the first end in the longitudinal direction of the transparent member;
• a first pressing member pressing an opposite surface opposite a contact surface of the transparent member toward the housing at a position closer to the center than the first contact portion in the longitudinal direction of the transparent member, the contact surface being a surface on which the first contact portion comes into contact with the transparent member;
• a second pressing member pressing the opposite surface of the transparent member toward the housing at a position closer to the center than the second contact portion in the longitudinal direction of the transparent member;
• and
• a protruding portion, in a case where viewed from an upstream side in the conveyance direction of the recording material passing through the conveyance path between the second reading unit and the second guide portion, disposed between the first contact portion and the second contact portion and protruding from the facing surface of the housing, a protruding amount of the protruding portion being smaller than protruding amounts of the first contact portion and the second contact portion.