A holding frame 46 made of a material to bear a greater shear stress than a distal end portion rigid portion 31 (a distal end portion 5) is adhered and fixed to the distal end rigid portion 31 in a state where one end face is exposed from an inclined surface 37a, and an image guide 16 and a light guide 22 are held through the holding frame 46. In addition, a groove 49 is provided on a side surface of the holding frame 46 and one end of the groove 49 is exposed on a distal end face 37 (the inclined surface 37a) of the distal end rigid portion 31, to thereby realize downsizing of the distal end portion without lowering durability and improve repairability.
