A sheet feeding roller (101) which feeds a sheet S stacked on a sheet supporting plate (110) capable of being lifted and lowered is swingably supported at a swing end of a sheet feeding roller supporting arm (104) which is arranged swingablyin an up-and-down direction and a roller biasing member (103) applies a force to the sheet feeding roller supporting arm (104) in a direction that the sheet feeding roller (101) is pressed to sheets S stacked on a sheet stack tray (61). A swing fulcrum (104a) is arranged in arange between a tangential line of the sheet feeding roller (101) at the upstreammost pressing position against the sheet feeding direction and a tangential line of the sheet feeding roller (101) at the downstreammost pressing position out of pressing positions where the sheet feeding roller (101) is pressed to the sheets as being varied inaccordance with a sheet stacking state of the sheets.