A rotary work device holding an electrode fitted to a distal end of a shank of a spot welding gun with a holder and simultaneously rotating the holder about a central axis of the electrode to perform an electrode detachment operation in which the electrode is detached from the distal end of the shank, or bringing a cutter into contact with a distal end surface of the electrode fitted to the distal end of the shank and rotating the cutter about the central axis of the electrode to perform an electrode cutting operation in which the distal end surface of the electrode is cut away, the device comprising: a pair of rotators (32, 42) into each of which the holder or the cutter is fitted, and which each have an outer periphery including a plurality of annularly arranged teeth (33c, 42a), and are arranged radially in parallel such that rotation axes (C1, C2) of the rotators face in an identical direction; an actuator including an intermediate gear meshing with some of the teeth (33c, 42a) of each rotator, and a servomotor rotating the intermediate gear; and a controller including a memory that is connected to the servomotor and stores a first rotational speed and a different second rotational speed higher than the first rotational speed, characterised in that when the electrode detachment operation is performed using at least one of the rotators (32, 42), the controller outputs a detachment start signal to the servomotor to rotate both of the rotators (32, 42) at the first rotational speed, and when the electrode cutting operation is performed using at least the other one of the rotators (32, 42), the controller outputs a cutting start signal to the servomotor to rotate both of the rotators (32, 42) at the second rotational speed, an electrode container is provided radially outward from one of the rotators (32, 42), and is capable of containing a plurality of unused electrodes such that a central axis of each electrode faces in a direction in which the rotation axis (C1, C2) of the one of the rotators (32, 42) faces, and a location at which one of the electrodes contained in the electrode container is ejected from the electrode container is in a straight line connecting the rotation centers (C1, C2) of the rotators (32, 42). a pair of rotators (32, 42) into each of which the holder or the cutter is fitted, and which each have an outer periphery including a plurality of annularly arranged teeth (33c, 42a), and are arranged radially in parallel such that rotation axes (C1, C2) of the rotators face in an identical direction; an actuator including an intermediate gear meshing with some of the teeth (33c, 42a) of each rotator, and a servomotor rotating the intermediate gear; and a controller including a memory that is connected to the servomotor and stores a first rotational speed and a different second rotational speed higher than the first rotational speed, characterised in that when the electrode detachment operation is performed using at least one of the rotators (32, 42), the controller outputs a detachment start signal to the servomotor to rotate both of the rotators (32, 42) at the first rotational speed, and when the electrode cutting operation is performed using at least the other one of the rotators (32, 42), the controller outputs a cutting start signal to the servomotor to rotate both of the rotators (32, 42) at the second rotational speed, an electrode container is provided radially outward from one of the rotators (32, 42), and is capable of containing a plurality of unused electrodes such that a central axis of each electrode faces in a direction in which the rotation axis (C1, C2) of the one of the rotators (32, 42) faces, and a location at which one of the electrodes contained in the electrode container is ejected from the electrode container is in a straight line connecting the rotation centers (C1, C2) of the rotators (32, 42).