Patent ID: 8333689

Claim:
A medical operation device including: a rotary cylinder that includes an insertion portion inserting hole through which an insertion portion of a medical instrument for observation is inserted, the rotary cylinder being rotatably provided on a device main body; an insertion portion pressing member that presses the insertion portion of the medical instrument for observation which is inserted through the insertion portion inserting hole, to thereby pressingly fix the insertion portion with respect to the rotary cylinder, the insertion portion pressing member being provided inside the rotary cylinder; an insertion portion mounting section cover that is provided inside the insertion portion inserting hole and that prevents the insertion portion which is inserted through the insertion portion inserting hole from directly touching an inner face of the insertion portion inserting hole, a vicinity of an opening of the insertion portion inserting hole, and the insertion portion pressing member; and a switching instruction portion that switches whether or not the insertion portion pressing member presses an outer surface of the insertion portion via the insertion portion mounting section cover and specifies a state in which the insertion portion is fixed to the rotary cylinder and a state in which the insertion portion moves forward/rearward with respect to the rotary cylinder, wherein the insertion portion mounting section cover includes: an inserting hole inner surface covering portion that covers a whole inner circumference of the insertion portion inserting hole and also an insertion portion pressing portion of the insertion portion pressing member, and has a through hole through which the insertion portion can be inserted; a rotary portion side surface covering portion that is provided on at least one end side of the inserting hole inner surface covering portion and that covers a side surface of the rotary cylinder in which an opening of the insertion portion inserting hole is formed; and a fixing portion that fixes the rotary portion side surface covering portion to the rotary cylinder.