To provide a desk which can be freely deployed, whose systematic and free deploying performance can be expanded in a flexible manner, and whose junction structure therefor is greatly simplified.

A wiring core member BC, shaped like a laterally long gutter, making the inside of the gutter usable for wiring space, is formed by providing a left and a right side walls 1 and 2 and front and back walls 3 and 4 to form a laterally long gutter-like member, with the upper surface open, and providing leg parts 5 for standing on the right and left sides. On the wiring core member BC and top plate support members 6 and 7 coupled with the front surface and/or the back surface, one or more top plates selected from among the top plates 8-12 of different lengths are supported.

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