A vibration welding device 40 includes: a vibration welding mold (40) that is configured including an upper mold (42U) and a lower mold (42L) divided in an up-down direction (A-B), that is fitted with a first component (20) and a second component (30) forming an elongated shape having a bent portion, and that is disposed with length directions of the first component (20) and the second component (30) along a left-right direction (C-D); plural first mold divisions (42U1-42U6) that configure one of the upper mold (42U) or the lower mold, and that are divided in the left-right direction (C-D); a pressing device (44) that is coupled to each of the plural first mold divisions (42U1-42U6), and that applies pressure to the first mold divisions (42U1-42U6); and a vibration device (46) that is coupled to each of the plural first mold divisions (42U1-42U6), and that vibrates the first mold divisions (42U1-42U6).
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