To provide a new useful base in which a stabilization leg is easily and appropriately introduced while coping with the problem of the rotation prevention of an adjuster.

In the base 1 composed by providing a screw hole 3a roughly in a vertical direction on a part of an installation material 14 and screwing the shaft part 41 of the adjuster 4 to the screw hole 3a in order to support a furniture body 2, the stabilization leg 5 is attached to the side face 14b1 of the installation material 14 relatively movably in an adjuster adjusting direction in the state of not being position-shifted in the longitudinal direction of the installation material 14 and also in a direction orthogonal to it, and a part of the stabilization leg 5 is fixed to a floor F to be used.