Bending operation device and endoscope

A bending operation device comprising:

• a bending lever that is tiltably supported with an angle to a longitudinal direction of an operation section of an endoscope;
• a wire pulling member that is provided inside the operation section, and includes a plurality of arm portions that are displaced according to tilting motion of the bending lever;
• a plurality of operation wires that are connected to the plurality of arm portions, and bend, by being pulled/slackened according to displacement of the wire pulling member, a bending portion that is provided in an insertion section of the endoscope;
• and
• a plurality of pulleys that are provided inside the operation section, and guide the plurality of operation wires to the plurality of arm portions, with the plurality of operation wires being substantially parallel to one another, when the bending lever is in a neutral position at which the bending portion is substantially straight,
• wherein two of the pulleys configured to change directions of two of the operation wires for bending the bending portion upward are pivotally supported by a same rotation shaft, and
• two of the pulleys that are different from the two pulleys and that are configured to change directions of two of the operation wires that are different from the two operation wires and that are for bending the bending portion downward are pivotally supported by a same rotation shaft.

A bending operation device comprising:

• a bending lever that is tiltably supported with an angle to a longitudinal direction of an operation section of an endoscope;
• a wire pulling member that is provided inside the operation section, and includes a plurality of arm portions that are displaced according to tilting motion of the bending lever;
• a plurality of operation wires that are connected to the plurality of arm portions, and bend, by being pulled/slackened according to displacement of the wire pulling member, a bending portion that is provided in an insertion section of the endoscope;
• and
• a plurality of pulleys that are provided inside the operation section, and guide the plurality of operation wires to the plurality of arm portions, with the plurality of operation wires being substantially parallel to one another, when the bending lever is in a neutral position at which the bending portion is substantially straight,
• wherein a cylinder of a suction valve is provided in the operation section, and
• the wire pulling member is arranged at a position rotated around a center axis of the bending lever so that the plurality of arm portions and the cylinder do not interfere with each other.