We have fabricated top omission organic light emitting diodes with transparent Ba/Ag double layer cathodes deposited by using thermal evaporation method. The device structure was $glass/Ni(200nm)/2-TNATA(15 nm)/{alpha}-NPD(15nm)Al_{q3}:C545T;(1%,;35nm)/BCP(5nm)/Ba(10nm)/Ag(8nm)$. The optical transmittance of the Ba(10 nm)/Ag(8 nm) layer was over 60 % in the visible wavelength region. The maximum efficiency of the device was $13.7;cd/A;at;0.69;mA/cm^{2}$ and the efficiency of over 10 cd/A was achieved at wide range of current densities and luminances.