Sheet container and image forming apparatus

A sheet container to contain a sheet, the sheet container comprising:

• a support unit including a plurality of engaged portions and configured to support the sheet;
• and
• a regulation unit movable with respect to the support unit, wherein the regulation unit comes into contact with an end of the sheet to regulate the sheet in position,
• wherein the regulation unit includes an operating member to be operated, a holding member configured to hold the operating member, a fixing member movable in cooperation with the operating member, and a cover configured to cover the operating member,
• wherein the fixing member is movable between an engaging position at which the fixing member engages with one of the plurality of engaged portions and a non-engaged position at which the fixing member does not engage with one of the plurality of engaged portions,
• wherein the operating member is configured to be engageable with the cover, and
• wherein the regulation unit is kept fixed to the support unit by the fixing member engaging with one of the plurality of engaged portions, with the cover engaging with the operating member.