The object of the invention is to provide a cartridge in which the remaining amount of liquid in a liquid chamber can be accurately detected. The air introducing port is provided in a position closer to an upper end of the largest outer surface in a vertical direction and in a position closer to a left end of the largest outer surface relative in a horizontal direction. The liquid detecting section is provided in a position closer to a lower end of the largest outer surface in the vertical direction and in a position closer to a right end of the largest outer surface in the horizontal direction.