歴史
Q: Why do worshippers put coins into an offertory box in shrine? 神社で賽銭箱にお金を入れるのはなぜですか？
A: The coins, called saisen in Japan, is a kind of offering which worshippers put into an offertory box as an expression of prayer to and reverence for the Kami.
賽銭と呼ばれるお金は参拝者が神様に対しての祈願や敬いの表現として納めている供物です。