A MEMS microphone includes a substrate having a cavity defining a vibration area and a peripheral area surrounding the vibration area, a back plate disposed over the substrate and having a plurality of acoustic holes, a diaphragm disposed between the substrate and the back plate to cover the cavity, the diaphragm defining an air gap together with the back plate, and the diaphragm sensing an acoustic pressure to generate a displacement, a plurality of anchors arranged along a circumference of the diaphragm, and spaced apart from each other to define a plurality of slits configured to serve as first vent channels for communicating the air gap with the cavity, and at least one vent hole penetrating through the diaphragm, and serving as a second vent channel for communicating the air gap with the cavity.