A lens unit includes: a lens barrel; a movable section including a movable lens and configured to be moved in an optical axis direction relative to the lens barrel; a linear actuator configured to move the movable section in the optical axis direction; and a biasing blade spring including a holding portion for holding the movable section, a plurality of spring portions capable of being elastically deformed and biasing the movable section in the optical axis direction, and an attachment portion to be attached to the lens barrel. The plurality of spring portions of the biasing blade spring are configured to restraint a movement force produced at the movable section in a plane orthogonal to the optical axis.