This disclosure aims to miniaturize a lens barrel. The lens barrel includes: a movable frame which has two cam followers provided in a circumferential direction about an optical axis and two guide protrusions arranged along an optical axis direction; a cam frame having two cam grooves with which the two cam followers of the movable frame are engaged respectively; and a guide frame having one guide groove with which the two guide protrusions are engaged. The two cam followers and the two guide protrusions restrict tilting of the movable frame with respect to the cam frame and the guide frame.