Each clip 1 is fitted into a cutaway groove portion 6 of a pedestal portion 5 of each assembling portion 3 provided on a bottom surface portion of a console box 2. After that, a positioning boss 7 is fitted into a long hole 43 formed in an attachment receiving member 41, and at the same time, a fitting head portion 28 of each clip 1 is fitted into each long hole 42 formed in the attachment receiving member 41. As each fitting head portion 28 is fitted into each long hole 42 formed in the attachment receiving member 41 and a boss portion 22 slides in the cutaway groove portion 6. Each of a pair of elastic locking pieces 31 is elastically locked with the periphery of each longer side portion of each long hole 42.