Robot arm, having: - a basic frame, - a slide, which is mounted displaceably in a vertical direction on the basic frame, and a first motor, which is designed to adjust the slide relative to the basic frame, - a proximal pivoting member, which is mounted pivotably about a vertical first axis of rotation on the slide, and a second motor, which is designed to pivot the proximal pivoting member relative to the slide, - an intermediate pivoting member, which is mounted pivotably about a vertical second axis of rotation on the proximal pivoting member, and a third motor, which is designed to pivot the intermediate pivoting member relative to the proximal pivoting member, - a distal pivoting member, which is mounted pivotably about a vertical third axis of rotation on the intermediate pivoting member, and a fourth motor, which is designed to pivot the distal pivoting member relative to the intermediate pivoting member, - an actuating member carrier, which is mounted rotatably about a horizontal fourth axis of rotation on the distal pivoting member, and furthermore having: a first switchover device (9.1), which is designed to switch over the actuating member carrier between a first locking pivoting position, in which the actuating member carrier takes up a first position, and a second locking pivoting position, in which the actuating member carrier takes up a second position, which deviates from the first position, for mechanically reconfiguring the kinematic structure of the robot arm, characterized in that the actuating member carrier can be reconfigured between precisely two positions by means of the switchover device (9.1). - a basic frame, - a slide, which is mounted displaceably in a vertical direction on the basic frame, and a first motor, which is designed to adjust the slide relative to the basic frame, - a proximal pivoting member, which is mounted pivotably about a vertical first axis of rotation on the slide, and a second motor, which is designed to pivot the proximal pivoting member relative to the slide, - an intermediate pivoting member, which is mounted pivotably about a vertical second axis of rotation on the proximal pivoting member, and a third motor, which is designed to pivot the intermediate pivoting member relative to the proximal pivoting member, - a distal pivoting member, which is mounted pivotably about a vertical third axis of rotation on the intermediate pivoting member, and a fourth motor, which is designed to pivot the distal pivoting member relative to the intermediate pivoting member, - an actuating member carrier, which is mounted rotatably about a horizontal fourth axis of rotation on the distal pivoting member, and furthermore having: a first switchover device (9.1), which is designed to switch over the actuating member carrier between a first locking pivoting position, in which the actuating member carrier takes up a first position, and a second locking pivoting position, in which the actuating member carrier takes up a second position, which deviates from the first position, for mechanically reconfiguring the kinematic structure of the robot arm, characterized in that the actuating member carrier can be reconfigured between precisely two positions by means of the switchover device (9.1). a first switchover device (9.1), which is designed to switch over the actuating member carrier between a first locking pivoting position, in which the actuating member carrier takes up a first position, and a second locking pivoting position, in which the actuating member carrier takes up a second position, which deviates from the first position, for mechanically reconfiguring the kinematic structure of the robot arm, characterized in that the actuating member carrier can be reconfigured between precisely two positions by means of the switchover device (9.1).