Dipping-treatment installation for vehicle bodies, comprising a) at least one dipping basin (38, 40, 42) which is fillable with a treatment liquid into which the vehicle bodies to be treated can be dipped; b) a conveying system which can move the vehicle bodies to be treated up to the dipping basin (38, 40, 42), into the interior of the dipping basin (38, 40, 42), out of the dipping basin (38, 40, 42) and away from the latter and which comprises at least one transport unit which carries a fastening device (24; 24, 36) therewith, via which the vehicle body is couplable to the transport unit; wherein: c) the at least one transport unit is a multi-axis conveying robot with a chassis, which is movable along a travelling axis, characterized in that the conveying robot comprises a robot arm with an arm joint, which carries the fastening device (24; 24, 36) which is formed by a robot handpiece or by a robot handpiece and an adaptor; d) the robot handpiece is assigned two movement axes (BA1, BA2) which are perpendicular to each other; e) a movement axis is predetermined by the arm joint; f) the robot arm is pivotable upwards and downwards about a horizontal movement axis at the end remote from the robot handpiece and is rotatable about a vertical movement axis in relation to the chassis. a) at least one dipping basin (38, 40, 42) which is fillable with a treatment liquid into which the vehicle bodies to be treated can be dipped; b) a conveying system which can move the vehicle bodies to be treated up to the dipping basin (38, 40, 42), into the interior of the dipping basin (38, 40, 42), out of the dipping basin (38, 40, 42) and away from the latter and which comprises at least one transport unit which carries a fastening device (24; 24, 36) therewith, via which the vehicle body is couplable to the transport unit; wherein: c) the at least one transport unit is a multi-axis conveying robot with a chassis, which is movable along a travelling axis, characterized in that the conveying robot comprises a robot arm with an arm joint, which carries the fastening device (24; 24, 36) which is formed by a robot handpiece or by a robot handpiece and an adaptor; d) the robot handpiece is assigned two movement axes (BA1, BA2) which are perpendicular to each other; e) a movement axis is predetermined by the arm joint; f) the robot arm is pivotable upwards and downwards about a horizontal movement axis at the end remote from the robot handpiece and is rotatable about a vertical movement axis in relation to the chassis. c) the at least one transport unit is a multi-axis conveying robot with a chassis, which is movable along a travelling axis, characterized in that the conveying robot comprises a robot arm with an arm joint, which carries the fastening device (24; 24, 36) which is formed by a robot handpiece or by a robot handpiece and an adaptor; d) the robot handpiece is assigned two movement axes (BA1, BA2) which are perpendicular to each other; e) a movement axis is predetermined by the arm joint; f) the robot arm is pivotable upwards and downwards about a horizontal movement axis at the end remote from the robot handpiece and is rotatable about a vertical movement axis in relation to the chassis.