Sheet feeding apparatus and image forming apparatus

A sheet feeding apparatus comprising:

• a supporting unit pivotably provided at an apparatus body, configured to be openable and closable with respect to the apparatus body, and having a support surface that supports a sheet in a state where the supporting unit is opened;
• a feeding unit configured to feed the sheet supported on the support surface;
• a side regulating portion configured to regulate a position of an end portion in a sheet width direction of the sheet supported on the support surface;
• an air nozzle movably provided at the side regulating portion and configured to blow air in the sheet width direction toward at least an uppermost sheet of a sheet bundle supported on the support surface;
• and
• an air supplying unit configured to supply the air to the air nozzle,
• wherein the air nozzle is configured to be positioned at a first nozzle position for blowing the air to a first blowing position in a case where the uppermost sheet of the sheet bundle supported on the support surface is positioned at a first sheet position, and
• wherein the air nozzle is configured to be positioned at a second nozzle position for blowing the air to a second blowing position below the first blowing position in a case where the uppermost sheet of the sheet bundle supported on the support surface is positioned at a second sheet position below the first sheet position.