A lens barrel includes a barrel-shaped first barrel having a pair of cam grooves that have two cam locus curves congruent with each other and are separated from each other on a circumferential surface, and a second barrel that has a pair of cam pins formed of a first cam pin that is engaged with one of the pair of cam grooves and a second cam pin that is engaged with another of the pair of cam grooves, and an urging portion that urges the first cam pin in a radial direction of the first barrel, and moves in an optical axis direction relatively to the first barrel, and is configured such that in engagement of the pair of cam pins and the pair of cam grooves, a disposition distance between the pair of cam pins differs from a disposition distance between the pair of cam grooves.