The invention relates to a robot arm (2), having a plurality of joints (5) and a plurality of links (4), which each connect two adjacent joints (5) to one another, wherein at least one of said links (4) has a human-machine interface (6), comprising at least one display means (7, 7.2), which is designed to display at least one system state of the robot arm (2) and/or of a control device (3) connected in terms of control technology to the robot arm (2), and comprising at least one input means (8), which is designed to supply at least one manual input via the human-machine interface (6) to the robot arm (2) and/or to a control device (3) connected in terms of control technology to the robot arm (2), wherein the at least one input means (8) comprises a tactile sensor surface (8.1) arranged on an outer casing wall (M) of the link (4) and the at least one display means (7, 7.2) comprises a display surface (7.1) superimposed on the tactile sensor surface (8.1).