13. The image reading apparatus according to claim 9 , wherein the slide contact portion is integral with the rear surface of the main unit.
9. An image reading apparatus comprising: a main unit comprising a document support surface configured to support a document on the document support surface, the main unit further comprising an upper surface including the document support surface, and a rear surface located at a rear of the document support surface and extending vertically below the upper surface; a reading unit accommodated in the main unit and configured to read an image of the document supported on the document support surface; and an openable unit coupled to the main unit and configured to pivot about a pivot axis between a closed position where the document support surface of the main unit is covered and a released position where the document support surface of the main unit is exposed, the openable unit having a facing surface that faces the upper surface of the main unit when the openable unit is located in the closed position, the facing surface having a rear end portion located close to the pivot axis, wherein one of the rear surface of the main unit and the facing surface of the openable unit includes a slide contact portion that, when the openable unit is in the released position, contacts the other of the rear surface of the main unit and the facing surface of the openable unit, and wherein the pivot axis of the openable unit is located, in the main unit, below the document support surface and at the rear of the document support surface.