Rotary Table

A rotary table comprising:

• a base body having a planar holding surface;
• a worm wheel disposed on the base body to be rotatable around an axis, the worm wheel having an outer circumferential surface with a first gear formed over an entire area in a circumferential direction;
• an inner ring disposed on an inner circumference side of the worm wheel and fixed to the base body;
• a plurality of rolling elements disposed to be able to roll on an inner circumferential surface of the worm wheel and an outer circumferential surface of the inner ring;
• and
• a worm screw unit fixed on the holding surface;
• the worm screw unit including
• a worm screw held to be rotatable around an axis, the worm screw having a second gear meshing with the first gear, and
• a worm screw housing surrounding and holding the worm screw, the worm screw housing being fixed to contact the holding surface at a planar contacting surface thereof,
• one of the holding surface and the contacting surface having a cylindrical pin arranged to protrude therefrom,
• the other of the holding surface and the contacting surface having a first recess formed to receive the pin, and being elongated in a radial direction of the worm wheel, the pin being movable in the first recess in a radial direction of the worm wheel.