An image forming apparatus comprising: a main body comprising: two first frames disposed to face each other; and a second frame disposed to bridge a gap between the two first frames; an image forming unit disposed between the two first frames; characterized by a feed roller unit configured to feed a sheet in a sheet feeding direction towards the image forming unit, the feed roller unit comprising: a first roller having a first rotational axis line extending in such a direction as to bridge the gap between the two first frames; and a second roller having a second rotational axis line substantially parallel to the first rotational axis line, the second roller being supported by the second frame, so as to contact the first roller in a position away from the first frame; an urging member configured to provide an urging force in an urging direction substantially parallel to the first frames so as to bring the first roller and the second roller into contact with each other; and a sheet-shaped spacer detachably attached between the main body and one of the first roller and the second roller, in the vicinity of at least one of the first frames, so as to lead to one of separating the first roller from the second roller and weakening a contact force between the first roller and the second roller, against the urging force provided by the urging member (201 C). a main body comprising: two first frames disposed to face each other; and a second frame disposed to bridge a gap between the two first frames; two first frames disposed to face each other; and a second frame disposed to bridge a gap between the two first frames; an image forming unit disposed between the two first frames; characterized by a feed roller unit configured to feed a sheet in a sheet feeding direction towards the image forming unit, the feed roller unit comprising: a first roller having a first rotational axis line extending in such a direction as to bridge the gap between the two first frames; and a second roller having a second rotational axis line substantially parallel to the first rotational axis line, the second roller being supported by the second frame, so as to contact the first roller in a position away from the first frame; a first roller having a first rotational axis line extending in such a direction as to bridge the gap between the two first frames; and a second roller having a second rotational axis line substantially parallel to the first rotational axis line, the second roller being supported by the second frame, so as to contact the first roller in a position away from the first frame; an urging member configured to provide an urging force in an urging direction substantially parallel to the first frames so as to bring the first roller and the second roller into contact with each other; and a sheet-shaped spacer detachably attached between the main body and one of the first roller and the second roller, in the vicinity of at least one of the first frames, so as to lead to one of separating the first roller from the second roller and weakening a contact force between the first roller and the second roller, against the urging force provided by the urging member (201 C).