To provide a foldable table for preventing the operation of a caster through a linking mechanism linked with the displacement of a top plate when horizontally extending the top plate and turning the table to a using state.

One end of the first link L1 of an operation linking mechanism is pivotally attached P1 to a top plate supporting frame 6, the first link L1 is pivotally attached to one end P3 of a transmission link L3 pivotally attached P5 to a stud 3 through a second link L2 and the other end of a transmission link L3 is pivotally attached P4 to the upper end of a connection link L4 to a lower end of which a caster elevating and lowering member is pivotally attached. Since the attachment shaft of the caster is connected to the caster elevating and lowering member, the caster elevating and lowering member is vertically moved by the tilting of the top plate supporting frame 6, the lower end of the caster is grounded by displacing the lower end of the caster to a position higher than a stand S fixed to a leg base bottom surface and only the caster is grounded by displacing it to the position lower than that.