Lens barrel and imaging device

摘要

A lens barrel 111 according to the present invention includes: a lens group 220 which moves along an optical axis direction 300; and a lens holding frame 224 holding a lens group 220. A guide hole 406 is provided in the lens holding frame 224, the guide hole 406 being penetrated by a main shaft 440 having a circular cross section. A cross section of the guide hole 406 taken orthogonal to a longitudinal direction of the main shaft 440 includes at least two linear portions 406a, and the main shaft 440 is in contact with the two linear portions 406a.