Provided is a welded processed product which is reduced in the hear deformation thereof and can exhibit improved the welding strength between component processed articles. A welded processed products, wherein a first convex column (13) and second convex columns (14A and 14B) to be subjected to the vibration-welding with a joining surface (11a) of a first processed article (11) with each other are provided on a joining surface (12a) of a second processed article (12). When or after the above first and second convex columns (13) and the second convex columns(14A and 14B) and the joining surface 11a of the first processed article 11 are vibration-welded together by use f a vibration welding machine, a cooling fluid from a cooling fluid source 26 is supplied to a region surrounded by the first convex column 13 via a supply port 15 and discharged therefrom via a discharge port 16 so as to effect cooling in the region.
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