Sheet feeding apparatus and image forming apparatus

An image forming apparatus having a sheet feeding apparatus provided with a regulating member movable for regulating a position of a sheet that is contained in a containing portion , the image forming apparatus comprising:

• a holding mechanism holding the regulating member in a sheet regulated position corresponding to a sheet size;
• and
• an operating portion disposed at the regulating member and configured to release the regulating member from being held by the holding mechanism,
• wherein the holding mechanism includes a holding member provided at the regulating member and an elastic member, the holding member has an engaging portion, and the regulating member is held by an engagement between the engaging portion and an engaged portion disposed at the containing portion,
• wherein the holding member is provided slidably in an engagement direction for the engagement of the engaging portion and the engaged portion and in a disengagement direction for release of the engagement of the engaging portion and the engaged portion, and the holding member is biased in the engagement direction by the elastic member, and
• wherein the regulating member can be moved in one direction or an other direction opposite to the one direction for regulating the sheet, and the operating portion is press-operated in a direction intended to move the regulation member, thereby the holding member is slid in the disengagement direction and the regulating member is released from being held by the holding mechanism.