An external mechanism for endoscope includes a wheel engaged with a second bending operation up and down knob of a second bending operation apparatus provided in an operation portion of an endoscope, a motor configured to generate driving force for rotating the wheel, an operation switch for outputting a driving control signal to the motor, a container case containing the wheel and the motor, a case attachment and detachment fixation member with which the container case can be attached to and detached from the operation portion, a switch case attached to the container case and configured to be able to turn between a first position covering a part of the operation portion and a second position away from the first position, and a dummy switch provided in the switch case and configured to operate a remote switch arranged in the operation portion in the first position via the switch case.