A bending operation device, includes: a bending lever that is inclinably supported with respect to an operation section of an endoscope an arm part that is provided in the bending lever and includes a distal end displaceable in conjunction with inclination operation of the bending lever and an intermediate lever that is swingably supported with respect to the operation section, includes a force point at a middle of the intermediate lever, and includes a point of application at a position farther from a fulcrum (a shaft portion) than the force point, the force point being connected to the distal end of the arm part through an intermediate wire, and the point of application being connected to a bending wire.
