An image reading apparatus includes a scanner and an ADF. The scanner includes a housing having an upper surface which is formed of a document table glass and a through-read glass. The housing contains first and second carriages which can slide along rails. In a through-read mode, the first carriage is moved to a reading position below the through-read glass, and the case of the first carriage is magnetically held by a fixing mechanism, and the first carriage is fixed at a reading position. A vibration-absorbing member is interposed between the fixing mechanism and the case.