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We discuss the relation between the CP violation of the quark mixing and thatof the lepton mixing by investigating a CP violating observable, the Jarlskoginvariant, as well as the CP violating Dirac phase. The down-type quark massmatrix with three zeros is given in terms of the minimal number of parameters,while the up-type quark mass matrix is diagonal. These quark mass matricesleading to the successful CKM mixing angles and CP violation are embedded inboth the Pati--Salam and SU(5) models. The leptonic Jarlskog invariant$J_{CP}^l$ (as well as CP violating Dirac phase) is examined for two cases: theneutrino mass matrix is diagonal or non-diagonal, where no additional CPviolating phase is introduced apart from the Majorana phases. In the case ofthe diagonal neutrino mass matrix, the favorable sign of the leptonic CPviolation is obtained, however, the magnitude of $J_{CP}^l$ is at most ${\calO}(10^{-4})$, which is too small compared with the expected value from theobservation $-0.02$. In the case of the non-diagonal neutrino mass matrix wherethe tri-bimaximal mixing pattern is taken, we obtain the successful $J_{CP}^l$up to its sign.

Sign of CP Violating Phase in Quarks and Leptons