An imaging unit at a tip end portion of an insertion section has a board on which the image pickup device is installed, a cable through which a signal is input to and output from the board, and a ground bar which is provided so as to protrude from the surface of the board and is connected to a ground of the board. In a distal portion of the cable on the imaging unit side, a shield part is connected to the ground of the board through the ground bar and a core line is directly assembled on the board. The ground bar supports the cable on the board such that the height of the cable in the vicinity of a board-mounting portion of the cable becomes greater than or equal to a predetermined value.
