To provide a wet type multi-plate clutch equipped with a friction plate which is low in frictional coefficient during idling, stable in quality without generating a variation in frictional characteristic during engagement, low in shock during engagement, excellent in heat resistance, and sharply reduces dragging torque during idling as compared with conventional ones. 空転時の摩擦係数が小さく、係合時の摩擦特性のバラツキがなく品質が安定していると共に、係合時のショックが少なく、耐熱性があって、かつ空転時の引き摺りトルクを従来に比べて大幅に低減したフリクションプレートを備えた湿式多板クラッチを提供する。 - 特許庁