25 and the inner fixing protrusion 27 are inserted into the corresponding lower fixing hole 17 and the corresponding coupling hole 19 and then bent by a predetermined angle it is preferable that one end of each of the lower fixing protrusion 25 and the inner fixing protrusion 27 should be protruded perforating the holes 17 and 19 accordingly it is preferable that each of the lower fixing protrusion 25 and the upper fixing protrusion 27 has a length greater than a depth of each of the corresponding holes 17 and 19 also it is preferable that an end corner of each of the upper fixing protrusion 23 the lower fixing protrusion 25 and the inner fixing protrusion 27 is rounded to be easily inserted into the corresponding hole the procedure for coupling the decoration panel 14 to the console 13 will now be described with reference to fig2 and 3 first the second bent portion 22 is inserted into the first groove 15 at this time the upper fixing protrusion 23 is inserted into the upper fixing hole 16 thereafter the decoration panel 14 is rotated by a predetermined angle centering on the upper fixing protrusion 23 inserted into the upper fixing hole 16 and is then loaded into the front surface of the console 13 herein the first extending portion 24 is inserted into the first groove 15 and the second extending portion 26 is inserted into the second groove 16 the lower fixing protrusion 25 is inserted into the lower fixing hole 17 and the.