Abstract: This application relates to an optical scanner having a mirror self-angle adjustment function, and a mirror angle adjustment method thereof. In one aspect, the optical scanner includes a mirror that reflects light and an electrostatic driver that pivots the mirror. The electrostatic driver includes a fixed electrode part having a plurality of driving electrodes, which are connected to the mirror and arranged in rows, and a plurality of fixed electrodes arranged in rows alternately with the plurality of driving electrodes and pivoting the mirror via an applied driving voltage. The plurality of fixed electrodes include a plurality of main electrodes to which the driving voltage is applied, and a plurality of additional electrodes. The plurality of additional electrodes are electrically isolated from the plurality of main electrodes, and the driving voltage is selectively applied to the plurality of additional electrodes.