A microphone includes a microphone case having an opening in front of the microphone case accommodating a microphone unit in the opening; a piece of double-sided adhesive tape whose back side is attached along the opening of the front side of the microphone case; and a filter adhered to a front side of the piece of the double-sided adhesive tape so as to cover the opening of the microphone case, wherein the piece of the double-sided adhesive tape is provided with sound introduction holes which introduces sound waves to the microphone unit through the filter. This configuration enables to provide a microphone easily and in a short time having desired frequency response characteristics without raising costs.