Image reading apparatus and image forming apparatus

摘要

An image reading apparatus includes: an opening/closing portion (2) configured to be rotatable around a hinge shaft; a biasing portion configured to apply a force to the opening/closing portion (2) such that moment of the hinge shaft rotation higher than moment of the hinge shaft rotation according to self-weight of the opening/closing portion (2) is generated in a state in which the opening/closing portion (2) is placed in a range up to a predetermined rotation angle from a closed position with respect to the apparatus main body (100), and moment of the hinge shaft rotation that is balanced with the moment of the hinge shaft rotation according to the self-weight of the opening/closing portion (2) is generated in a state in which the opening/closing portion (2) is opened more than the predetermined rotation angle; and a holding portion configured to maintain the opening/closing portion (2) at the closed position.