A micro speaker is provided. The micro speaker includes a diaphragm, at least one coil coupled with the diaphragm, a magnet configured to interact with a magnetic field induced by the at least one coil, and a yoke plate located on a bottom of the magnet to support the magnet and including a hole therein, top and bottom ends of the hole being opened. An area, adjacent to the hole, of a lower surface of the yoke plate has a height difference relative to another area of the lower surface of the yoke plate.