Lens barrel and exterior housing

An exterior housing comprising:

• an exterior body that has an opening portion and has a tubular shape;
• a cover member that covers the opening portion from an outside of the exterior body;
• a fitted portion that is provided on an inner surface side of the cover member, and is fitted into the opening portion to position the cover member with respect to the exterior body in a case where the opening portion is covered with the cover member;
• a fixation portion that is provided on an inner surface side of the cover member and is disposed inside the exterior body through the opening portion in a case where the opening portion is covered with the cover member;
• and
• a spring member that is engaged with the fixation portion and an inner wall surface portion of the exterior body and biases the cover member in a direction in which the cover member is pulled into an inside of the exterior body, wherein
• the spring member is formed of a leaf spring and has a main body portion mounted onto the fixation portion and a spring portion to be engaged with the inner wall surface portion of the exterior body,
• the fixation portion has a slit into which a portion of the main body portion of the spring member is inserted, and
• the spring member is mounted onto the fixation portion with the portion of the main body portion inserted into the slit.