An image reading apparatus has an image reading portion, a sheet feeding portion feeding the sheet to the image reading portion, a rotatably connecting portion which rotatably connects the sheet feeding portion to the image reading portion, a fixing member, a first fastening member for fastening the fixing member to a frame of the sheet feeding portion, and a second fastening member for fastening the fixing member to the rotatably connecting portion in a state where the frame is nipped between the rotatably connecting portion and the fixing member. When the fastening of the first fastening member is released and the fastening of the second fastening member is released, the fixing member is detachable from the frame and the rotatably connecting portion.