Patent ID: 8743540

Claim:
An electronic apparatus which has a plurality of basic structures arranged adjacent to each other in a direction perpendicular to a gravitation direction, each of the basic structures comprising: a casing; a board placed parallel to the gravitation direction inside the casing; a space with large ventilation amount and a space with small ventilation amount formed by the board dividing the inner space of the casing, the ventilation amounts depending on the size of their air passage; vents in the upper and lower surfaces of the casing; an electronic component placed on the board in the space with large ventilation amount; and an electronic component placed on the board in the space with small ventilation amount, wherein the casings of adjacent ones of the basic structures are in communication through inner vents in respective side walls of the casings, and external vents that are in communication with the outside are provided in left and right side walls of the electronic apparatus.