Microphone unit and audio apparatus

A microphone unit comprising:

• a case having an interior space;
• a microphone held in the interior space of the case;
• a first opening provided in the case;
• and
• a second opening provided in the case,
• wherein the first opening and the second opening are arranged opposite to each other across the microphone and are arranged in a straight line parallel to an axis of sensitivity of the microphone,
• wherein the case comprises a main body and a lid,
• wherein the main body comprises:
• a bottom part;
• a wall part surrounding peripheries of the bottom part;
• a holder holding the microphone and dividing the interior space into two spaces, wherein the interior space is defined by the bottom part and the wall part;
• and
• a third opening at a side opposite to the bottom part,
• wherein the lid covers a part of the third opening of the main body and is in contact with the holder,
• wherein the first opening is a part of the third opening and is a gap between the lid and the wall part located at a first side in a longitudinal direction of the main body, and
• wherein the second opening is a part of the third opening and is a gap between the lid and the wall part located at a second side in the longitudinal direction of the main body, the second side being opposite to the first side.