Lens barrel, and lens apparatus and image pickup apparatus including same

A barrel apparatus comprising:

• a base barrel in which a straight groove, extending in a direction of an optical axis, is formed;
• a cam member being rotatable around the optical axis relative to the base barrel, in which a first cam groove and a second cam groove are formed;
• an optical element barrel holding a first optical element;
• a first moving barrel including a first cam follower in contact with the straight groove and the first cam groove;
• a second moving barrel holding a second optical element, and including a second cam follower in contact with the straight groove and the second cam groove;
• and
• an elastic member disposed between the first moving barrel and the second moving barrel and biasing the first moving barrel and the second moving barrel in mutually opposite directions along the optical axis in a state where the optical element barrel is detachably attached to the first moving barrel,
• wherein the elastic member includes a coil spring which includes a bent portion as an end, of the coil spring, bent toward a radial direction,
• wherein a concave portion, which is concave in the direction of the optical axis, is formed in at least one of the first moving barrel and the optical element barrel to house at least a part of the bent portion,
• wherein the at least a part of the bent portion is housed in a clearance formed between the first moving barrel and the optical element barrel in the direction of the optical axis with the concave portion in a state where the optical element barrel is attached to the first moving barrel so that a position of the at least a part of the bent portion is regulated in the direction of the optical axis by the first moving barrel and the optical element barrel.