To provide a highly versatile bonded body in which a surface of a solid bonding base material made of a resin or a rubber that is hardly bonded, is bonded to a different and solid base material to be bonded, and both solid bonding base material are easily integrated with each other.SOLUTION: The bonded body is provided in which a bonding base material and a base material to be bonded are bonded together and integrated through covalent bonding: of molecules of a molecular adhesive obtained by graft copolymerization through an active group of a surface of the bonding base material; and an active group of a surface of the base material to be bonded. The bonding base material is formed of any one selected from among a fluorine resin, a fluorine rubber, a silicone resin, a silicone rubber, an ethylene-propylene-diene rubber, an ethylene-propylene-diene-methylene rubber, an isobutylene-isoprene copolymer rubber, an isoprene...
