Provided is a three-dimensional auxiliary member that can easily impart additional effects to existing containers. The auxiliary member 1 includes a body 15 to which a first sheet body 11 having a first heat shrinkage rate and a second sheet body 12 having a second heat shrinkage rate lower than the first heat shrinkage rate are connected, and an adhesive layer 16 located on an outer surface of the body 15, A cross section when the body 15 is cut on a plane perpendicular to the longitudinal direction includes an annular shape, and at least a part of the first sheet body 11 is positioned between both ends of the second sheet body 12 in the cross section. Figure 1

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