Reinforcement rubber evaluating method

Provided is a reinforcement rubber evaluating method which is for evaluating a reinforcement rubber obtained by embedding, in a rubber material, a core wire having a coating film attached on the surface and the inside of a base material fiber, and which is characterized by comprising: a first step for extracting the core wire from the reinforcing rubber such that the content of the base material fiber forming the core wire is 60% or higher by weight; and a second step for performing measurement using a pulse method NMR on the coating film attached on the surface and the inside of the base material fiber forming the extracted core wire.