The disclosed technology is directed to a medical device comprises an endoscope having an operation portion and a flexible insertion portion extending from the operation portion. The operation portion is used to manipulate the flexible insertion portion during an operation. The operation portion includes an elongated body defined by respective flat and incline surfaces having a predetermined angle with respect to one another on one side. A bending operation member mounted on the incline surface and projected outwardly therefrom toward the flat surface such that the bending operation member is protected by the flat surface so as to prevent the flexible insertion portion from unintentional bending when the endoscope not being in operation.
