Supporting device and robot arm

A supporting device for an elongate line routing device of a robot arm, wherein the line routing device includes a receiving space in which a portion of the line is mounted so as to be extendable in an extension direction corresponding to a longitudinal direction of the line routing device, the supporting device comprising:

• a first connection body designed to rigidly connect the first connection body to a line routing device;
• a second connection body designed to rigidly connect the second connection body to a link of a robot arm;
• and
• a bearing arrangement designed to guide the first connection body for movement relative to the second connection body in a first rotational degree of freedom about a first rotation axis oriented perpendicular to the extension direction and to support the first connection body for movement in a forcibly guided manner in a second rotational degree of freedom about a second rotation axis oriented perpendicular to both the extension direction and the first rotation axis, wherein the movement in the second rotational degree of freedom is dependent on the movement of the first connection body about the first rotational degree of freedom.