In this paper we introduce the quantum white noise (QWN) conservation operator N Q acting on nuclear algebra of white noise operators L(F θ (S ′ C (R)), F * θ (S ′ C (R))) endowed with the Wick product. Similarly to the classical case, we give a useful integral representation in terms of the QWNderivatives {D − t , D + t ; t ∈ R} for the QWN-conservation operator from which it follows that the QWN-conservation operator is a Wick derivation. Via this property, a relation with the Cauchy problem associated to the QWN-conservation operator and the Wick differential equation is worked out.Received 2012-1-22; Communicated by the editors. 2000 Mathematics Subject Classification. Primary 60H40; Secondary 46A32, 46F25, 46G20.