[Problem to be Solved] The present invention aims to provide steviol glycosyltransferase and a method for producing a steviol glycoside using this enzyme. [Means to Solve the Problem] The present invention provides steviol glycosyltransferase and a method for producing a steviol glycoside using this enzyme. The present invention provides a transformant transformed with a gene for steviol glycosyltransferase and a method for preparing such a transformant.