PURPOSE: To interconnect cabinet tracks without lacking a sense of beauty and without causing a complicated assembly structure, by forming a stepped surface on both side parts of the upper surface of a casing body at a position lower than the upper surface of the casing body, and mounting a coupling fitment on the stepped surface between the two casing bodies in a gap formed between a ceiling cover and the stepped surfaces.

CONSTITUTION: In an interconnection structure, which includes a casing body 21 having an opening part 23a on its upper surface and a ceiling cover 22 detachably mounted on the upper surface of the casing body 21, a stepped surface 21a is formed on both sides of the upper surface of the casing body 21 which is located below the upper surface of the casing body 21, and a gap 35 is formed between the ceiling cover 22 and the stepped surface 21a. A cou pling fitment 36 is mounted within the gap 35 on the stepped surface 21a of the casing body 21, whereby two cabinet tracks 20 are interconnected. For example, a flex part 25a formed on the upper end of the side plate 25 of the casing body 21 is fixed on the stepped part 23b of a ceiling frame 23 through a screw 28. The foregoing stepped surface 21a is formed by the upper surface of the flex part 25a.