An endoscope comprising: an objective optical section including a plurality of optical lenses (33, 34, 35, 36, 37), and a first barrel that houses the optical lenses, the optical lenses being integrally and fixedly provided therein; an image pickup optical section including a solid image pickup device, an optical member that forms an optical image passed through the objective optical section on an image pickup surface of the solid image pickup device, and a second barrel that houses the optical member and the solid image pickup device, the optical member and the solid image pickup device being integrally and fixedly provided therein, the second barrel being arranged so as to fit with the first barrel, and being fixed to the first barrel in an integrated manner via bonding after adjustment in position in an axial direction relative to the first barrel; a first adhesive that bonds the first barrel and the second barrel to each other; and characterized by a holding member including a material having a linear expansion coefficient lower than a linear expansion coefficient of the first barrel and a linear expansion coefficient of the second barrel, the holding member being fixed to a predetermined position on an outer surface of the first barrel and a predetermined position on an outer surface of the second barrel via bonding; and a second adhesive having a bonding strength higher than the bonding strength of the first adhesive, the second adhesive bonding the holding member to the outer surface of the first barrel or an inner surface of a through hole of the first barrel, and to the outer surface of the second barrel. an objective optical section including a plurality of optical lenses (33, 34, 35, 36, 37), and a first barrel that houses the optical lenses, the optical lenses being integrally and fixedly provided therein; an image pickup optical section including a solid image pickup device, an optical member that forms an optical image passed through the objective optical section on an image pickup surface of the solid image pickup device, and a second barrel that houses the optical member and the solid image pickup device, the optical member and the solid image pickup device being integrally and fixedly provided therein, the second barrel being arranged so as to fit with the first barrel, and being fixed to the first barrel in an integrated manner via bonding after adjustment in position in an axial direction relative to the first barrel; a first adhesive that bonds the first barrel and the second barrel to each other; and characterized by a holding member including a material having a linear expansion coefficient lower than a linear expansion coefficient of the first barrel and a linear expansion coefficient of the second barrel, the holding member being fixed to a predetermined position on an outer surface of the first barrel and a predetermined position on an outer surface of the second barrel via bonding; and a second adhesive having a bonding strength higher than the bonding strength of the first adhesive, the second adhesive bonding the holding member to the outer surface of the first barrel or an inner surface of a through hole of the first barrel, and to the outer surface of the second barrel.