To provide a cabinet made of an aluminum alloy which has sharp rounding of a ridge line or the sharp corner of a cabinet, is freely subjected to a hair-line machining, does not have any problem in designation and to provide a hair line machining method.

A top 1 made of an aluminum alloy plate being connected so that it can be bent, side surface plates 2 and 3, and bottom plates 4 and 5 are folded to compose a side surface frame, and a front frame 7 that is made of the aluminum alloy plate with a front hole at the front is applied to an opening 10 of the side surface frame by an adhesive 9.