The present invention relates to a currency converting machine. It includes a box body with door which can be locked, currency conversion processing portion which can be placed in the interior of thebox body, can be locked, in which at least one kind of paper money or coin can be stored, said currency conversion processing portion can pay at least one kind of below-mentinoed conversion paper money or coin, said conversion paper money or coin is equivalent to the paper money or coin to be converted. It has a returning counter, when the converted paper money and coin is returned in its interior, at the same time it can be counted, and has a management equipment which can input the information about stored amount of money and counting information of returning counter, and can acknowledge the state of the currency conversion.