A manual paper feeder suitable for being installed at a side surface of a main body of an image forming apparatus, comprising: a side surface cover that is turnably supported by the side surface of the main body and selectively located at one of an open position and a close position, the open position being where the side surface cover is opened by a predetermined angle from the side surface of the main body, the close position being where the side surface cover is housed in a recess portion formed at the side surface of the main body; a sheet loading tray that is located at a top surface of the side surface cover and capable of loading a sheet when the side surface cover is located at the open position; and a first auxiliary tray and a second auxiliary tray slidably disposed so as to overlap one another in a sheet loading direction at an upstream side of the seat loading tray in the feed direction, the first auxiliary tray being selectively located at a house position where the first auxiliary tray is housed so as to be overlapped between the side surface cover and the sheet loading tray or an extension position where the first auxiliary tray is extracted from the house position so as to extend a loading surface of the sheet loading tray, the second auxiliary tray extending the first auxiliary tray, characterized by a separation conveying unit including a feed member and a separation member, the feed member being located at a downstream side of the sheet loading tray in a feed direction for sending out a sheet to a feed direction, the separation member being located facing the feed member, the separation conveying unit separately conveying only one sheet at a most upper side of sheets loaded on the sheet loading tray; and an elevating plate located at the downstream side of the sheet loading tray in the feed direction so as to cause a downstream portion of the sheet to abut on the feed member; wherein when the first auxiliary tray is located at the extension position in a state where the second auxiliary tray is housed downwards, an abutment between an upstream side end edge of the side surface cover and an inferior surface of the second auxiliary tray supports the first auxiliary tray at a first angle (θ1), and when the second auxiliary tray is extracted from the first auxiliary tray at the extension position, an abutment between the upstream side end edge of the side surface cover and the inferior surface of the first auxiliary tray supports the first auxiliary tray at a second angle (θ2), the second angle (θ2) being smaller than the first angle (θ1). a side surface cover that is turnably supported by the side surface of the main body and selectively located at one of an open position and a close position, the open position being where the side surface cover is opened by a predetermined angle from the side surface of the main body, the close position being where the side surface cover is housed in a recess portion formed at the side surface of the main body; a sheet loading tray that is located at a top surface of the side surface cover and capable of loading a sheet when the side surface cover is located at the open position; and a first auxiliary tray and a second auxiliary tray slidably disposed so as to overlap one another in a sheet loading direction at an upstream side of the seat loading tray in the feed direction, the first auxiliary tray being selectively located at a house position where the first auxiliary tray is housed so as to be overlapped between the side surface cover and the sheet loading tray or an extension position where the first auxiliary tray is extracted from the house position so as to extend a loading surface of the sheet loading tray, the second auxiliary tray extending the first auxiliary tray, characterized by a separation conveying unit including a feed member and a separation member, the feed member being located at a downstream side of the sheet loading tray in a feed direction for sending out a sheet to a feed direction, the separation member being located facing the feed member, the separation conveying unit separately conveying only one sheet at a most upper side of sheets loaded on the sheet loading tray; and an elevating plate located at the downstream side of the sheet loading tray in the feed direction so as to cause a downstream portion of the sheet to abut on the feed member; wherein when the first auxiliary tray is located at the extension position in a state where the second auxiliary tray is housed downwards, an abutment between an upstream side end edge of the side surface cover and an inferior surface of the second auxiliary tray supports the first auxiliary tray at a first angle (θ1), and when the second auxiliary tray is extracted from the first auxiliary tray at the extension position, an abutment between the upstream side end edge of the side surface cover and the inferior surface of the first auxiliary tray supports the first auxiliary tray at a second angle (θ2), the second angle (θ2) being smaller than the first angle (θ1).