An endoscope has a section of an elongated tube for entry in a body cavity. An end shell is disposed at a distal end of the elongated tube. An imaging window area is formed in the end shell. A lens barrel is secured to the end shell, and aligned with the imaging window area. An imaging device photoelectrically detects object light from the lens barrel. A circuit board has the imaging device mounted thereon. A signal cable has a cover material, and plural filaments covered by the cover material, and connected to the circuit board. A cable retaining device partially retains the cover material fixedly. A tip portion is formed at a distal end of the cable retaining device. A coupling device keeps the tip portion laterally movable on the end shell, to prevent stress in the cable retaining device from exertion to the end shell.