Sheet-feeding cassette and image forming apparatus

An image forming apparatus comprising:

• a main body casing;
• and
• a sheet-feeding cassette that is removably attached to the main body casing;
• wherein the sheet-feeding cassette comprises:
• a stacking member being capable of stacking a plurality of sheets, the stacking member including first engaging sections provided at intervals corresponding to sizes of the sheets to be stacked, and second engaging sections provided at intervals which are smaller than those of the first engaging sections;
• and
• a regulatory member being movable with respect to the stacking member, the regulatory member regulating the position of the sheets, the regulatory member including an operation section that is operated at the time of movement of the regulatory member and is capable of being displaced, a first engaged section that is capable of engaging with the first engaging sections and is elastically deformable, and a second engaged section that is capable of engaging with the second engaging sections;
• wherein the second engaged section is displaced in a direction so as to be disengaged from the second engaging sections in accordance with displacement of the operation section;
• and
• the first engaged section is elastically deformed as a result of being interlocked with the second engaged section according to displacement of the operation section, such that urging force exerted on the first engaging sections becomes stronger.