The information processing apparatus of the invention includes: a display section having a display screen on one surface thereof; a main unit that supports the display section so that the display section can open and close with the one surface arranged inside, and, when opened, serves as a base to erect the display section; and an input section that is physically detachably coupled to the main unit so as to be flush with the main unit. The input section has operating members for inputting information arrayed on a top surface thereof. The length of the sum of the input section and the main unit in a direction of the depth thereof when coupled is substantially same as the length of the display section in the same direction when closed.