Insertion device

An insertion device comprising:

• a first magnet array including a plurality of magnets placed in an array;
• a first magnet supporting member adapted to support the first magnet array which is mounted to the first magnet supporting member;
• a second magnet array including a plurality of magnets placed in an array and being faced to the first magnet array with a gap interposed between the first magnet array and the second magnet array;
• a second magnet supporting member adapted to support the second magnet array which is mounted to the second magnet supporting member;
• a gap driving mechanism for driving the first magnet supporting member and/or the second magnet supporting member in a vertical direction for changing a size of the gap;
• a driving conjunction mechanism for coupling the gap driving mechanism and the magnet supporting members to each other;
• a compensation spring mechanism adapted to act in such a direction as to compensate for an attractive force acting on the first magnet array and the second magnet array;
• a spring conjunction mechanism for coupling the compensation spring mechanism and the magnet supporting members to each other;
• a first supporting frame for supporting the gap driving mechanism;
• a second supporting frame for supporting the compensation spring mechanism;
• and
• a common base placed on a placement surface;
• wherein
• the first supporting frame and the second supporting frame are individually coupled to the common base.