Lens barrel and imaging device

A lens barrel comprising:

• a lens barrel main body that holds an optical system;
• a first operation member that is provided around the lens barrel main body and adjusts an optical function of the optical system;
• a second operation member that is provided around the lens barrel main body and varies a degree of adjustment of the optical function by the first operation member;
• and
• a processor configured to perform, in a case where the first operation member is operated, control of executing a first mode in which the optical function is adjusted according to a setting pattern, and
• wherein, in the setting pattern, an amount of increase in an adjustment speed is large at a rising edge of the operation, and the amount of increase in the adjustment speed is gradually small as a pressing time elapses,
• wherein the second operation member is provided with a lock knob, which constitutes a restriction mechanism to switch between a restriction state and a release state for a rotation of the second operation member.