To provide a fan boss capable of reducing weight and cost, and capable of improving adhesive reliability of a vibration control rubber layer.

A coaxially arranged substantially cylindrical fan boss body 1 composed of a polyamide resin and an inner cylinder member 2 are chemically adhered to the vibration control rubber layer 3 composed of a vulcanization material of a special rubber composition using the following (A) to (D) as essential components. (A) a diene-based rubber or rubber having a methylene group, (B) a vulcanizing agent, (C) a resorcinol compound, and (D) a melamine-based resin.