An elbow forming apparatus having a forming arbor with an exterior groove for accommodating a tube. A movable mandrel assembly, including a wiping member, is disposed opposite the arbor and has a further groove which cooperates with the arbor to confine the tube therebetween. An elongated rodlike mandrel is slidably inserted into the free end of the tube, after the latter has been fed into a position adjacent the arbor. The mandrel assembly is mounted on a first support structure which is rotatably supported on a second support structure, the latter being slidably supported on a third support structure which is rotatably supported on a frame for rotative movement. A cam-and-follower connects the mandrel assembly to the arbor so that, upon swinging movement of the third support structure, the mandrel assembly and the associated wiper is swingably moved around the arbor which causes a simultaneous and substantially linear retraction of the mandrel from the tube accompanied by a simultaneous bending of the tube about the arbor. The groove formed in the arbor preferably includes an intermediate straight portion joined between two bend portions, and the cam-and-follower maintains the mandrel assembly and the wiper closely adjacent the arbor during the swinging of the third support structure.