Abstract: An alarm sound emitting apparatus is installed at inside of an outer shell member surrounding a space and emits alarm sound to outside by vibrating an outer shell member. The alarm sound emitting apparatus is provided with a piezoelectric element for generating vibration, a support rod for supporting the piezoelectric element and transmitting vibration, an elastic member for pressing the support rod to the vibrating plate, a magnet for fixing the support rod to the vibrating plate, a circuit board formed with various circuits including a circuit of driving the piezoelectric element, and a cabinet for containing respective elements of the piezoelectric element and the like.