An image forming apparatus comprising: an automatic document feeder including a housing and configured to feed an original document sheet along a conveyance path inside the housing; a main body including a document reading section that reads an image from the original document sheet fed by the automatic document feeder; and a hinge portion openably and closably connecting the housing to the main body, wherein the main body forms an image on a recording medium on the basis of a signal generated by the document reading section, the hinge portion includes a first fixing portion fixed on the housing and a second fixing portion fixed on the main body, the first fixing portion being turnable relative to the second fixing portion, in opening or closing the housing against the main body, the first fixing portion turns relative to the second fixing portion, the automatic document feeder further includes: a paper feed tray on which the original document sheet to be fed to the conveyance path is set; an exit tray onto which the original document sheet having been fed along the conveyance path is discharged; a conveyance roller pair disposed inside the housing and configured to pinch the original document sheet with pressure and feed the original document sheet along the conveyance path; and a pressure releasing mechanism configured to reduce a pinching pressure of the conveyance roller pair or detach one roller (313b-317b) of the conveyance roller pair from the other roller (313a-317a) in conjunction with an operation of opening the housing against the main body, wherein the pressure releasing mechanism includes an axis moving member that is slidably supported inside the housing and has an elongated hole formed therein for guiding an axis of the one roller (313b-317b) of the conveyance roller pair, the elongated hole having a major axis extending in a direction diagonally intersecting with a direction in which the axis moving member slides, the pressure releasing mechanism is connected to the hinge portion, and the axis moving member slides, in conjunction with turning of the first fixing portion in opening the housing against the main body, to move the axis of the one roller (313b-317b) of the conveyance roller pair along the elongated hole, thereby reducing the pinching pressure of the conveyance roller pair, or detaching the one roller (313b-317b) of the conveyance roller pair from the other roller (313a-317a). an automatic document feeder including a housing and configured to feed an original document sheet along a conveyance path inside the housing; a main body including a document reading section that reads an image from the original document sheet fed by the automatic document feeder; and a hinge portion openably and closably connecting the housing to the main body, wherein the main body forms an image on a recording medium on the basis of a signal generated by the document reading section, the hinge portion includes a first fixing portion fixed on the housing and a second fixing portion fixed on the main body, the first fixing portion being turnable relative to the second fixing portion, in opening or closing the housing against the main body, the first fixing portion turns relative to the second fixing portion, the automatic document feeder further includes: a paper feed tray on which the original document sheet to be fed to the conveyance path is set; an exit tray onto which the original document sheet having been fed along the conveyance path is discharged; a conveyance roller pair disposed inside the housing and configured to pinch the original document sheet with pressure and feed the original document sheet along the conveyance path; and a pressure releasing mechanism configured to reduce a pinching pressure of the conveyance roller pair or detach one roller (313b-317b) of the conveyance roller pair from the other roller (313a-317a) in conjunction with an operation of opening the housing against the main body, wherein a paper feed tray on which the original document sheet to be fed to the conveyance path is set; an exit tray onto which the original document sheet having been fed along the conveyance path is discharged; a conveyance roller pair disposed inside the housing and configured to pinch the original document sheet with pressure and feed the original document sheet along the conveyance path; and a pressure releasing mechanism configured to reduce a pinching pressure of the conveyance roller pair or detach one roller (313b-317b) of the conveyance roller pair from the other roller (313a-317a) in conjunction with an operation of opening the housing against the main body, wherein the pressure releasing mechanism includes an axis moving member that is slidably supported inside the housing and has an elongated hole formed therein for guiding an axis of the one roller (313b-317b) of the conveyance roller pair, the elongated hole having a major axis extending in a direction diagonally intersecting with a direction in which the axis moving member slides, the pressure releasing mechanism is connected to the hinge portion, and the axis moving member slides, in conjunction with turning of the first fixing portion in opening the housing against the main body, to move the axis of the one roller (313b-317b) of the conveyance roller pair along the elongated hole, thereby reducing the pinching pressure of the conveyance roller pair, or detaching the one roller (313b-317b) of the conveyance roller pair from the other roller (313a-317a).