We have derived the masses of central objects ( M _ { BH } ) of nine type 2 Seyfert nuclei using the observational properties of the hidden broad H \beta emission .
We obtain the average dynamical mass , log ( M _ { BH } / M _ { \odot } ) \simeq 8.00 \pm 0.51 - 0.475 { log } ( \tau _ { es } / 1 ) where \tau _ { es } is the optical depth for electron scattering .
If \tau _ { es } \sim 1 , this average mass is almost comparable with those of type 1 Seyfert nuclei .
However , if \tau _ { es } \ll 1 , as is usually considered , the average mass of type 2 Seyfert nuclei may be more massive than that of type 1s .
We discuss implications for issues concerning both the current unified model of Seyfert nuclei and physical conditions of the electron scattering regions .