A cassette configured to receive loading of a plurality of sheets and to be extendable in a first direction, the cassette comprising: a first sheet accommodation section; a second sheet accommodation section configured to be slidably attached to the first sheet accommodation section; and a restricting section configured to restrict sliding of the second sheet accommodation section, wherein the restricting section includes: at least one first engagement section (38a, 38b) disposed in the first sheet accommodation section; a manipulation section disposed in the second sheet accommodation section; and a second engagement section (78a, 78b) disposed in the manipulation section and configured to engage with the first engagement section, the manipulation section has a base end portion connected with the second sheet accommodation section and a lever portion continuous from the base end portion, the lever portion is shiftable from a lying down posture to a tilted posture when so manipulated, the second engagement section is disposed in the lever portion, and shift of the lever portion from the lying down posture to the tilted posture releases engagement between the at least one first engagement section and the second engagement section, and allows the lever portion to be pulled in the first direction to slide the second sheet accommodation section and extend a size of the cassette, the cassette being characterized in that the lever portion has a through hole, and a bottom of the first sheet accommodation section has a cutout portion that is corresponding to a region of movement of the through hole in accompaniment to the sliding of the second sheet accommodation section. a first sheet accommodation section; a second sheet accommodation section configured to be slidably attached to the first sheet accommodation section; and a restricting section configured to restrict sliding of the second sheet accommodation section, wherein the restricting section includes: at least one first engagement section (38a, 38b) disposed in the first sheet accommodation section; a manipulation section disposed in the second sheet accommodation section; and a second engagement section (78a, 78b) disposed in the manipulation section and configured to engage with the first engagement section, at least one first engagement section (38a, 38b) disposed in the first sheet accommodation section; a manipulation section disposed in the second sheet accommodation section; and a second engagement section (78a, 78b) disposed in the manipulation section and configured to engage with the first engagement section, the manipulation section has a base end portion connected with the second sheet accommodation section and a lever portion continuous from the base end portion, the lever portion is shiftable from a lying down posture to a tilted posture when so manipulated, the second engagement section is disposed in the lever portion, and shift of the lever portion from the lying down posture to the tilted posture releases engagement between the at least one first engagement section and the second engagement section, and allows the lever portion to be pulled in the first direction to slide the second sheet accommodation section and extend a size of the cassette, the cassette being characterized in that the lever portion has a through hole, and a bottom of the first sheet accommodation section has a cutout portion that is corresponding to a region of movement of the through hole in accompaniment to the sliding of the second sheet accommodation section.