A multi-spot welding arrangement in which a jig table on the front surface of a machine frame has a plurality of welding guns located along the shape or contour of the workpiece to be processed or worked. An electric supply has a plurality of units which are connected to the welding guns through respective electric supply cables. A pressure applying mechanism has a plurality of operation cylinders which are connected to the welding guns through respective flexible wires, and is located on the rear side and the upper side of the machine frame. The machine frame, moreover, has a front frame and a rear frame which are coupled together in a detachable manner. The jig table and the pressure applying mechanism are located on the front frame, and the electric supply is provided on the rear frame.