This lens unit comprises: a lens having a liquid crystal lens; a rim part that covers the peripheral edge section of the lens; a control unit that controls the liquid crystal lens; a conductive part that electrically connects the control unit and an electrode end section of the liquid crystal lens which is exposed at the peripheral edge section of the lens, and that is disposed between the rim part and the peripheral edge section of the lens; and a knob part that protrudes from the lens or rim part.