  If we are given an $H$-$G$-biset $U$ for finite groups $G$ and $H$, then any
Mackey functor on $G$ can be transformed by $U$ into a Mackey functor on $H$.
In this article, we show that the biset transformation is also applicable to
Tambara functors when $U$ is right-free, and in fact forms a functor between
the category of Tambara functors on $G$ and $H$. This biset transformation
functor is compatible with some algebraic operations on Tambara functors, such
as ideal quotients or fractions. In the latter part, we also construct the left
adjoint of the biset transformation.
