An embodiment of an operation table may include a table for loading a patient； a base buried or fixed to a floor； and a robot arm, a first end of the robot arm supported by the base and a second end of the robot arm supporting the table. The robot arm may include a vertical joint rotatable about a rotational axis extending in a horizontal direction； and a joint activation mechanism that activates the vertical joint. The joint activation mechanism may include: a motor； a first speed reducer that reduces a speed of rotation transmitted from the motor to output slower rotation； and a second speed reducer that reduces a speed of the slower rotation transmitted from the first speed reducer to output slower rotation.
