A sheet feed cassette having: a main body to be set in a body of an image forming apparatus; a first press-up member configured to support print media stacked thereon; a first elastic member configured to apply an elastic force to make the first press-up member press up the print media; a second press-up member; a second elastic member configured to apply an elastic force to make the second press-up member press up the first press-up member or the print media; an adjusting mechanism configured to adjust the force of the second press-up member to press up the first press-up member or the print media in accordance with a size of the print media; and a regulatory mechanism configured to prevent the second press-up member from pressing up the first press-up member or the print media when the main body is detached from the body of the image forming apparatus.