Optical unit and endoscope

An endoscope configured to be inserted into an inside of a subject to observe the inside of the subject, the endoscope comprising:

• an optical unit;
• an imager configured to convert light guided by the optical unit into an electrical signal;
• and
• a controller configured to control driving of the optical unit, wherein
• the optical unit includes:
• a fixed portion having a cylindrical shape;
• a movable portion holding a lens, the movable portion being arranged movably inside the fixed portion;
• a first slider that is arranged between the fixed portion and the movable portion, the first slider being configured to slide with a movement of the movable portion;
• a second slider that is arranged between the fixed portion and the movable portion, and at a position different from a position of the first slider, the second slider being configured to slide with the movement of the movable portion;
• a driver that includes a coil and a magnet, the driver being configured to move the movable portion in a direction of an optical axis of the lens relative to the fixed portion;
• and
• a biasing part that is arranged outside the movable portion, the biasing part being configured to cause the magnet to generate a biasing force to push the movable portion toward the fixed portion, wherein
• the fixed portion includes a first rail portion and a second rail portion guiding a movement of the first slider and the second slider, respectively, and extending in a direction of the optical axis,
• the biasing part is arranged at a position facing the second rail portion through the optical axis of the lens,
• the first slider abuts on the first rail portion, and is pushed in a direction horizontal to the biasing force, and
• the second slider abuts on the second rail portion, and is pushed in a direction perpendicular to the biasing force.