A variable focus liquid lens includes: a lens barrel which is configured to include a first cavity to contain first and second liquids which are not mixed with each other in upper and lower portions of the first cavity, respectively; a fluid pressure driving unit which is configured to include a second cavity, a fluid pressure generating groove, and an actuator generating a fluid pressure on the second liquid so as to adjust the fluid pressure of the second liquid by using the actuator; a first transparent elastic membrane sealing an upper portion of the first cavity of the lens barrel; and a conductive transparent substrate sealing a lower portion of the second cavity of the fluid pressure driving unit. The focal length is adjusted by changing the curvatures of the surfaces of the first and second liquids and the curvature of the first transparent elastic membrane by a voltage.