Vibration device, article conveyance device, and article sorting device

A vibration device comprising a base supported on a ground surface via a vibration isolation spring, a movable bench elastically supported with respect to the base, a first horizontal excitation unit that vibrates the movable bench in a first horizontal direction, a second horizontal excitation unit that vibrates the movable bench in a second horizontal direction that crosses the first horizontal direction, and a vertical excitation unit that vibrates the movable bench in a vertical direction, and the vibration device comprising:

• a first middle bench and a second middle bench between the base and the movable bench, and the vibration device including:
• a plurality of first horizontal elastic support units, a plurality of second horizontal elastic support units, and a plurality of vertical elastic support units that elastically connect the base, the first middle bench, the second middle bench, and the movable bench sequentially in the first horizontal direction, the second horizontal direction, and the vertical direction, wherein
• the vibration device is configured such that if overall device is supposed as a first mass body, a second mass body, and a third mass body with the first horizontal elastic support units and the second horizontal elastic support units as boundaries, respective barycentric positions of these mass bodies are almost the same in the vertical direction and horizontal direction.