A grip body including a mounting portion, an inner piece supported by the mounting portion and at least a resin communication passage therebetween. The inner piece includes inner and outer surfaces, and a resin layer is integrally formed on the inner and outer surfaces of the inner piece by resin extending therebetween through the resin communication passage. The grip body also includes at least one plate having an insertion rod formed thereon, the plate being fixed to the inner piece by insertion engagement of the insertion rod into the resin communication passage. The plate is heated by providing a heating member attached at a position where the heating of temperature of a resin surface portion of the grip body is desired.