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An external mechanism for endoscope includes a bending wheel, a motor, a housing case, and an operation switch, a case side fitting surface and a switch side fitting surface are formed flat to each other, and when a protrusion is provided on a contact surface of the housing case, a recess is provided on a contact surface of the operation switch, whereas when a protrusion is provided on the contact surface of the operation switch, a recess is provided on the contact surface of the housing case.