There is provided a narrow directional microphone in which a microphone unit can surely be positioned coaxially in an acoustic tube, and satisfactory electrostatic shielding can be attained. In the narrow directional microphone including an acoustic tube 10 consisting of a metallic cylindrical body, and a unidirectional microphone unit 20 arranged in a rear end part 10b of the acoustic tube 10 with a predetermined gap A serving as a sound wave passage being provided therebetween, the narrow directional microphone further includes a unit positioning means 60 consisting of plate spring material that positions the microphone unit 20 coaxially with the acoustic tube 10 and makes the width of the gap A between the inside diameter of the acoustic tube 10 and the outside diameter of the microphone unit 20 uniform.