A cartridge configured to supply a printing material to a printing device, comprising: a printing material container that is capable of containing the printing material; a printing material supplier that supplies the printing material contained in the printing material container to the printing device; a first surface and a second surface that are opposed to each other in the Y-axis direction, the first surface being located on the -Y-axis direction side of the printing material container, and the direction of attachment of the cartridge being the -Y-axis direction; a third surface that intersects with the first surface and the second surface, the third surface being a bottom face, when the cartridge is attached to the printing device; the fourth surface that is opposed to the third surface in the Z-direction, the fourth surface being an upper face, when the cartridge is attached to the printing device; wherein the third surface is located on the -Z-axis direction side of the printing material container, the -Z-axis direction being the vertically downward direction, when the cartridge is attached to the printing device, a cartridge-side engagement structure that is provided on the third surface at a position closer to the first surface than the second surface and is configured to be engaged with a device-side engagement structure of the printing device; and contact portions (cp) that are provided in an area where both an end of the first surface proximate to the fourth surface and an end of the fourth surface proximate to the first surface are located and are configured to be in electric contact with the printing device, wherein a contact surface defined by the contact portions is inclined to the fourth surface. a printing material container that is capable of containing the printing material; a printing material supplier that supplies the printing material contained in the printing material container to the printing device; a first surface and a second surface that are opposed to each other in the Y-axis direction, the first surface being located on the -Y-axis direction side of the printing material container, and the direction of attachment of the cartridge being the -Y-axis direction; a third surface that intersects with the first surface and the second surface, the third surface being a bottom face, when the cartridge is attached to the printing device; the fourth surface that is opposed to the third surface in the Z-direction, the fourth surface being an upper face, when the cartridge is attached to the printing device; wherein the third surface is located on the -Z-axis direction side of the printing material container, the -Z-axis direction being the vertically downward direction, when the cartridge is attached to the printing device, a cartridge-side engagement structure that is provided on the third surface at a position closer to the first surface than the second surface and is configured to be engaged with a device-side engagement structure of the printing device; and contact portions (cp) that are provided in an area where both an end of the first surface proximate to the fourth surface and an end of the fourth surface proximate to the first surface are located and are configured to be in electric contact with the printing device, wherein a contact surface defined by the contact portions is inclined to the fourth surface.