To provide a system which prevents inconvenience such as interference or damage between furniture pieces when used with other furniture by improving the table part which is combined with other furniture more frequently.

The table has legs 22 having four front and rear and right and left posts 22F and 22R each having a lower end capable of moving through a caster 21 as a ground contact portion, and a top plate 24 supported by the rear right and left posts 22F and 22R. The rear right and left posts 22F and 22R each include a guide part 25 projecting right and left for guiding back and forth. They are composed so that the projecting quantity δ of the guide part 25 can be larger than the appropriative extent AE in the horizontal direction of the casters 21 of the rear right and left posts 22F and 22R.