Provided are a transformant produced by introducing a gene coding for a cis-prenyltransferase and a gene coding for a Nogo-B receptor, which are considered to be involved in polyisoprenoid biosynthesis, into a host to allow the host to express the cis-prenyltransferase and the Nogo-B receptor, and a method for producing a polyisoprenoid using the transformant. The present invention relates to a transformant produced by introducing a gene coding for a cis-prenyltransferase and a gene coding for a Nogo-B receptor into a host to allow the host to express the cis-prenyltransferase and the Nogo-B receptor.
