A motor-driven bending endoscope includes a removal restriction mechanism (72) which restricts removal of a trackball (45) from a trackball mounting portion (70), and an operation section engaging portion (71) which detachably engages an attachment/detachment portion (63) with an operation section attachment portion (30) at a time of coupling between the operation section attachment portion (30) and the attachment/detachment portion (63) when an operation section unit (12) is attached to the operation section attachment portion (30). The operation section engaging portion (71) and the removal restriction mechanism (72) are interlockingly driven by an interlock drive mechanism (73). Thereby, there is provided a motor-driven bending endoscope which can reduce fatigue of the right hand at a time of performing a twisting operation of an insertion section, improve the recognizability of the up-and-down direction at a time of inserting the insertion section, and enhance the operational work efficiency.
