Sheet feeding apparatus and image forming apparatus

A sheet feeding apparatus comprising a sheet cassette storing a sheet and feeding the sheet from the sheet cassette, the sheet cassette comprising:

• a cassette body configured to store the sheet;
• a sheet supporting plate provided rotatably within the cassette body such that the sheet stored in the cassette body is stacked thereon;
• and
• an upstream end restricting mechanism provided within the cassette body to restrict an upstream end position in a sheet feeding direction of the sheet stored in the cassette body, the upstream end restricting mechanism comprising:
• a restricting mechanism body;
• a restricting member supported rotatably by the restricting mechanism body and abutting against an upstream end of the sheet to restrict the upstream end position of the sheet;
• an interlock member configured to engage with the restricting member and to move the restricting member by interlocking with a rotating operation of the sheet supporting plate between a hold position where the restricting member is held to the restricting mechanism body side and a project position where the restricting member projects to the sheet supporting plate side;
• a fixing member configured to fix the restricting mechanism body to the cassette body;
• an unlock mechanism configured to unlock the fixing member from the cassette body and to disengage the restricting member from the interlock member in linkage with the unlock of the fixing member from the cassette body to permit a position of the restricting mechanism body to be adjusted in the sheet feeding direction;
• and
• a bias portion that biases the restricting member disengaged from the interlock member by the unlock mechanism to the hold position.