PURPOSE: To share and rationalize assembly conditions and production facility conditions by making the outer size same for outer boxes of a simplified cabinet and a box assembly type cabinet.

CONSTITUTION: A simplified cabinet 7 is directly connected with side plates, a bottom plate 9, a top plate 10 and a back plate 11, and a door 13 is openably fitted via hinges 12. On the other hand, a box assembly type cabinet 14 is formed by inserting and fixing a box 16 molded with resin or metal through the front opening of an outer box 15 connected with the side plates 8, bottom plate 9, top plate 10 and back plate 11 commonly used with the simplified cabinet, and a door 18 is openably fitted via hinges 17 to the front opening of the box 16. The assembly conditions of the cabinet are standardized, the facility conditions of the production facility of the cabinet can be standardized, and productivity is improved.