A joined body includes: a first compact that includes a fiber-reinforced resin and a fiber exposure portion where a fiber of the fiber-reinforced resin is exposed, the fiber exposure portion being formed on at least a part of a surface of the first compact; a second compact that is joined to the first compact at the fiber exposure portion of the first compact; and a joint portion that is interposed between the fiber exposure portion of the first compact and the second compact.

Adhesive tape having at least two layers A and B laminated directly on one another, with at least one or both layers A or B being an adhesive, and the interfaces of the layers A and B laminated on one another being subjected to a physical method, the physical method being selected from the group consisting of corona discharge, dielectric barrier discharge, flame pretreatment and plasma treatment, before the layers are laminated to one another, with the two methods differing from one another.