The present invention provides a joining structure having higher joining strength than a joining structure of a rubber cored string in a conventional rubber ring. The present invention also provides a solidifying agent for joining a rubber cored string, which provides such a joining structure. The rubber cored string 11 joining structure 2 of the present invention has an adhesive in which both ends of a rubber cored string 11 are attached together or the ends of two rubber cored strings are attached together. It is the joining structure of the string with a rubber core joined by. Solidified portions 23 are formed by the solidified solidifying agent 25 at both ends of the rubber cored cord 11 or the ends of the two rubber cored cords. Porous particles are formed in the solidified portion 23. include. The solidifying agent 25 of the present invention is a solidifying agent that adheres to the 11 string with rubber core, and includes a solvent containing a solidifying component and porous particles put in the solvent. [Selection] Figure 1
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