A shaking apparatus for shaking a seat where a user sits down, including actuators, wherein the seat is supported by supporting parts at least at a front side, a rear left side and a right side, or a rear side, a front left side and a right side. The seat is inclined left or right by complementarily operating the actuators mounted to the left and right supporting parts to complementarily vary the distance from a floor of the left and right supporting parts, and the seat is inclined forward or backward by equally operating the actuators mounted to the left and right supporting parts to equally vary the distance of the left and right supporting parts from the floor.