PURPOSE: To provide a vibration-proof table foot structure, where the bearing surface of a tray member is surely covered, and a support leg can be easily adjusted in height.

CONSTITUTION: A vibration-proof table foot structure is equipped with a support leg 3 which is adjustable in height protruding from a device case 2 by controlling a rotary control 1, a tray member 4 mounting on a device installing floor 5 to bear the support leg 3 with a bearing surface 4a in a freely movable manner, and a dust cover 6 which covers the bearing surface 4a of the tray member 4 from above, where the dust cover 6 is formed of elastic material, and an insertion hole provided with cuts at its circumference where the support leg 3 is inserted is provided to the center of the dust cover 6.