HORN AND WELDING DEVICE

A horn according to an embodiment of the present invention to solve the problems includes a plurality of protrusion formation parts, each of which has a plurality of protrusions that protrude from a welding surface and are arranged in a line in at least one row, the plurality of protrusion formation parts respectively forming pattern formation parts on an outermost electrode tab of electrode tabs of a secondary battery and a protrusion-free part which is disposed between the plurality of protrusion formation parts and in which the protrusions are not provided to expose the welding surface to the outside, the protrusion-free part forming a pattern-free part on the outermost electrode tab. The protrusion-free part has a width greater than that of each of the protrusions.