The recombinant expression plasmid vectors and recombinant bacteria are used to produce oxalate decarboxylase, and a method of producing a recombinant oxalate decarboxylase

And to provide a means of high-producing microbial oxalate decarboxylase. And Bacillus (Bacillus) genus α- amylase promoter, to construct a recombinant expression plasmid vector containing the microbial oxalate decarboxylase gene originating placed under its control. The host bacterium is transformed with the vector, to prepare the oxalate decarboxylase producing bacterium. Further, after culturing the producing strain, by recovering the oxalate decarboxylase produced, to produce recombinant oxalate decarboxylase.