Endoscope

An endoscope comprising:

• an insertion main body which is extended along a longitudinal axis, and which is configured to be inserted into a lumen;
• an attachment unit which includes a fin portion spirally extended along the longitudinal axis, and which is provided to an outer peripheral direction side of the insertion main body in a state that a rotation thereof about the longitudinal axis with respect to the insertion main body is controllable, the attachment unit being configured to be unmovable with respect to the insertion main body in directions along the longitudinal axis while the rotation of the attachment unit about the longitudinal axis with respect to the insertion main body is controllable;
• a member inserting portion provided to a proximal direction side of the insertion main body;
• an imaging element which is provided inside of the insertion main body, and which is configured to image a subject;
• a rotary gear which is attachable to the insertion main body, and which is configured to rotate about a gear axis in a state that the rotary gear is attached to the insertion main body to control the rotation of the attachment unit, that is attached to the insertion main body, about the longitudinal axis;
• a partition member which is provided to the proximal direction side of the imaging element in the insertion main body, and which defines a gear arrangement portion on an outer peripheral portion thereof, the rotary gear, that is attached to the insertion main body, being arranged to the gear arrangement portion, the partition member defining the gear arrangement portion in a state that the gear arrangement portion opens toward the outer peripheral direction side at a first opening position and in a state that the gear arrangement portion opens with respect to an inside of the insertion main body at a second opening position, and the partition member being configured to separate the gear arrangement portion from the inside of the insertion main body so that a liquid flowed into the gear arrangement portion does not outflow to the inside of the insertion main body between the first opening position and the second opening position;
• a channel tube which is extended inside of the insertion main body, which has one end connected to the member inserting portion, and the other end connected to the partition member at the second opening position, the channel tube being fixed with respect to the insertion main body, a channel which communicates with the gear arrangement portion at the second opening position being provided in the channel tube, and the channel tube being connected to the partition member and the member inserting portion in a state that the liquid flowed into the channel does not outflow to an outside of the channel tube between the member inserting portion and the gear arrangement portion;
• and
• a first linear member which is insertable into the channel from the member inserting portion and removable from the channel through the member inserting portion, the first linear member being configured to move with respect to the channel tube along the gear axis when the first linear member is inserted into the channel and removed from the channel, and the first linear member being rotatable about the gear axis integral with the rotary gear attached to the insertion main body in a state that the first linear member is inserted into the channel.