  For a knot K in $S^3$ and a regular representation $\rho$ of its group $G_K$
into SU(2) we construct a non abelian Reidemeister torsion on the first twisted
cohomology group of the knot exterior. This non abelian Reidemeister torsion
provides a volume form on the SU(2)-representation space of $G_K$. In another
way, we construct according to Casson--or more precisely taking into account
Lin's and Heusener's further works--a volume form on the SU(2)-representation
space of $G_K$. Next, we compare these two apparently different points of
view--the first by means of the Reidemeister torsion and the second defined ``a
la Casson"--and finally prove that they define the same topological knot
invariant.
