Sheet feeding apparatus and image forming apparatus

A sheet feeding apparatus that feeds sheets, accommodated in a sheet cassette which is detachably mounted on an apparatus main body, in a sheet feeding direction by a sheet feeding portion, the sheet cassette including:

• a cassette main body arranged to accommodate at least two sizes of sheets, a first size and a second size smaller than the first size;
• a pair of opposing side end regulating portions which are provided in the cassette main body and are arranged to regulate the position of the side ends of the sheets in a width direction perpendicular to the sheet feeding direction, wherein at least one of the side end regulating portions is movable in the width direction;
• a first sheet pressing portion provided on one of the side end regulating portions;
• a second sheet pressing portion positioned downstream in the sheet feeding direction with respect to the first sheet pressing portion;
• a first biasing member, provided between one of the side end regulating portions and the first sheet pressing portion, which biases the first sheet pressing portion to press the sheets against a reference surface provided on the other side end regulating portion serving as a sheet conveyance reference;
• and
• a second biasing member, provided between one of the side end regulating portions and the second sheet pressing portion, which biases the second sheet pressing portion to press the sheets against the reference surface,
• wherein a pressing force to press the sheet by the second sheet pressing portion biased by the second biasing member is weaker than a pressing force to press the sheets by the first sheet pressing portion biased by the first biasing member,
• wherein the first sheet pressing portion comprises an indented portion that forms closely-aligned sheet biasing portions provided on both sides of the indented portion in the sheet feeding direction to press side ends of the sheets, and the indented portion is arranged to face upstream edges of the sheets of the second size in the sheet feeding direction, so that both of the sheet biasing portions and the second sheet pressing portion press the sheets of the first size against the reference surface, and one of the sheet biasing portions at a downstream side of the indented portion and the second sheet pressing portion press the sheets of the second size.