1. A microphone device comprising:a case that has a circuit board therein;
a microphone capsule that is apart from the case and has a plurality of sound collecting parts arranged on a surface of a sphere at predetermined intervals;
pillars that support the microphone capsule and couple (i) an opposed face of the case facing the microphone capsule and (ii) the microphone capsule; and
a protrusion part that is placed between the pillars and protrudes from the opposed face toward the microphone capsule, the protrusion part being formed such that a diameter of the protrusion part becomes smaller from a root coupled to the opposed face toward a tip.