We prove that on the bundle of connections of an arbitrary principal bundle
pi : P --> M there exists a canonical differential 2-form taking values in
the adjoint bundle pi(g) : adP --> M which defines a generalized symplecti
c structure and which verifies a property of "universal curvature". The res
ults of the present Note generalize those of [3] to an arbitrary Lie group.
(C) Academie des Sciences/Elsevier, Paris.