Input device and image forming apparatus

An input device mountable on an image forming apparatus that includes an image reading portion for reading an image of an original, an image forming portion capable of forming the image on a recording medium on the basis of a reading result of the image reading device, and an operating portion including a display screen capable of displaying a software key capable of inputting predetermined information, the input device comprising:

• a casing;
• a numerical key portion including a plurality of numerical keys capable of inputting information on numerical values of at least 0 to 9, the numerical keys being arranged as hardware keys;
• a connecting portion provided in the casing and capable of electrically connecting the image forming apparatus and the input device, the connecting portion being capable of outputting a signal to the image forming apparatus in response to an operation of the numerical key portion;
• and
• a USB port provided in the casing, the USB port being capable of USB-connecting external equipment different from the image forming apparatus to & the input device,
• wherein the connecting portion is capable of electrically connecting the USB-connected external equipment and the image forming apparatus, and
• wherein, as viewed from a front side of the numerical key portion, the USB port is provided on a side surface on a right side of the numerical key portion.