A lens curvature variation apparatus for varying a curvature of a liquid lens which is variable based on an applied electrical signal, the lens curvature variation apparatus comprising: a lens driver configured to apply the electrical signal to the liquid lens; a sensor unit configured to sense the curvature of the liquid lens formed based on the electrical signal; a temperature sensing unit configured to sense a temperature of a periphery of the liquid lens; and a controller configured to control the lens driver to form a target curvature of the liquid lens based on the sensed curvature, wherein the controller is configured to control the lens driver to output a changed electrical signal to the liquid lens to form the target curvature, based on the sensed temperature, wherein the controller is configured to vary a delay corresponding to a time difference between a plurality of pulses applied to the liquid lens, according to the sensed temperature wherein the lens driver is configured to supply the electrical signal to the liquid lens according to a switching operation of a switching element, and comprises a detection element (Rsens) connected to one end of the switching element, wherein the sensor unit is configured to sense an electrical signal detected by the detection element, wherein the liquid lens comprises: a common electrode; a plurality of electrodes (540a-540d) spaced apart from the common electrode; and a liquid and an electroconductive aqueous solution, the liquid and the electroconductive aqueous solution being disposed between the common electrode and the plurality of electrodes, wherein the sensor unit is configured to sense the electrical signal detected by the detection element at a point in time when a level of a pulse applied to the common electrode or a first electrode of the plurality of electrodes is varied. a lens driver configured to apply the electrical signal to the liquid lens; a sensor unit configured to sense the curvature of the liquid lens formed based on the electrical signal; a temperature sensing unit configured to sense a temperature of a periphery of the liquid lens; and a controller configured to control the lens driver to form a target curvature of the liquid lens based on the sensed curvature, wherein the controller is configured to control the lens driver to output a changed electrical signal to the liquid lens to form the target curvature, based on the sensed temperature, wherein the controller is configured to vary a delay corresponding to a time difference between a plurality of pulses applied to the liquid lens, according to the sensed temperature wherein the lens driver is configured to supply the electrical signal to the liquid lens according to a switching operation of a switching element, and comprises a detection element (Rsens) connected to one end of the switching element, wherein the sensor unit is configured to sense an electrical signal detected by the detection element, wherein the liquid lens comprises: a common electrode; a plurality of electrodes (540a-540d) spaced apart from the common electrode; and a liquid and an electroconductive aqueous solution, the liquid and the electroconductive aqueous solution being disposed between the common electrode and the plurality of electrodes, wherein the sensor unit is configured to sense the electrical signal detected by the detection element at a point in time when a level of a pulse applied to the common electrode or a first electrode of the plurality of electrodes is varied. a common electrode; a plurality of electrodes (540a-540d) spaced apart from the common electrode; and a liquid and an electroconductive aqueous solution, the liquid and the electroconductive aqueous solution being disposed between the common electrode and the plurality of electrodes, wherein the sensor unit is configured to sense the electrical signal detected by the detection element at a point in time when a level of a pulse applied to the common electrode or a first electrode of the plurality of electrodes is varied.