To increase driving torque with respect to a rotating shaft of a table, while suppressing wear and turning into high temperature for a tooth flank, in an index table that uses a worm gear device for driving the rotating shaft of the table.

In the index table using the worm gear device, a plurality of worm wheels are provided in the rotating shaft of the table, the worm of a worm shaft is engaged with each of the worm wheels, and the different worm wheels are mutually rotated by the same amount by a drive motor via a rotation transmission device.