Diaphragm and electroacoustic transducer

A diaphragm to be provided in an electroacoustic transducer, the diaphragm comprising:

• a plurality of first protrusions that protrude from at least one of a front face or a back face of the diaphragm and extends in a spiral from a center of the diaphragm or a vicinity of the center toward an outer circumference of the diaphragm;
• and
• a plurality of second protrusions that protrude from at least one of the front face or the back face of the diaphragm and extends in a spiral from the center of the diaphragm or a vicinity of the center toward an outer circumference of the diaphragm, the second protrusions extending in a direction opposite to a direction in which the first protrusions extend and intersecting with the first protrusions, wherein
• a total number of the first protrusions is different from a total number of the second protrusions.