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[en] We construct a low-energy effective Lagrangian for the two-color QCD including the 'vector' bosons (mesons with JP=1- and diquark baryons with JP=1+) in addition to the pseudo-Nambu-Goldstone bosons with a degenerate mass Mπ (mesons with JP=0- and baryons with JP=0+) based on the chiral symmetry breaking pattern of SU(2Nf)→Sp(2Nf) in the framework of the hidden local symmetry. We investigate the dependence of the vector boson masses on the baryon number density μB. We show that the μB-dependence signals the phase transition of U(1)B breaking. We find that it gives information about mixing among vector bosons: e.g. the mass difference between 'ρ' and 'ω' mesons is proportional to the mixing strength between the diquark baryon with JP=1+ and the antibaryon. We discuss the comparison with lattice data for two-color QCD at finite density.