An image reading apparatus includes a document placement unit, a document conveyance unit, a reading unit, a case, and a movable member. The document conveyance unit conveys a document, placed on the document placement unit, along a conveyance path. The case accommodates the reading unit and includes a transparent member which allows passing of light to receiving elements, and an opening. The movable member includes a cover portion and a connection portion and moves in an adjustment direction perpendicular to a longitudinal direction of the case. The cover portion covers the case opening while being in contact with an outside of the case. The connection portion connects the reading unit and the cover portion. When the movable member moves in the adjustment direction, the reading unit moves within the case to change an angle of the reading unit with respect to a document conveyance direction.