[en] Narrow-line Seyfert 1 galaxies (NLS1s) are arguably one of the key active galactic nucleus (AGN) subclasses in investigating the origin of the black hole mass–stellar velocity dispersion ($M_{\mathrm{B}\mathrm{H}}-<!--\; ???\; -->{\mathrm{\sigma <!--\; ??\; -->}}_{\ast <!--\; ???\; -->}$) relation because of their high accretion rate and significantly low $M_{\mathrm{B}\mathrm{H}}$ . Currently, it is under discussion whether present-day NLS1s offset from the $M_{\mathrm{B}\mathrm{H}}-<!--\; ???\; -->{\mathrm{\sigma <!--\; ??\; -->}}_{\ast <!--\; ???\; -->}$ relation. Using the directly measured stellar velocity dispersion of 93 NLS1s at z < 0.1, and $M_{\mathrm{B}\mathrm{H}}$ estimates based on the updated mass estimators, we investigate the $M_{\mathrm{B}\mathrm{H}}-<!--\; ???\; -->{\mathrm{\sigma <!--\; ??\; -->}}_{\ast <!--\; ???\; -->}$ relation of NLS1s in comparison with broad-line AGNs. We find no strong evidence that the NLS1s deviates from the $M_{\mathrm{B}\mathrm{H}}-<!--\; ???\; -->{\mathrm{\sigma <!--\; ??\; -->}}_{\ast <!--\; ???\; -->}$ relation, which is defined by reverberation-mapped type 1 AGNs and quiescent galaxies. However, there is a clear trend of the offset with the host galaxy morphology, i.e., galaxies that are more inclined toward the LOS have higher stellar velocity dispersions, suggesting that the rotational broadening plays a role in measuring stellar velocity dispersion based on the single-aperture spectra from the Sloan Digital Sky Survey. In addition, we provide the virial factor $\mathrm{l}\mathrm{o}\mathrm{g}f=0.05\pm <!--\; ??\; -->0.12$ (f = 1.12), for $M_{\mathrm{B}\mathrm{H}}$ estimators based on the FWHM of Hβ, by jointly fitting the $M_{\mathrm{B}\mathrm{H}}-<!--\; ???\; -->{\mathrm{\sigma <!--\; ??\; -->}}_{\ast <!--\; ???\; -->}$ relation using quiescent galaxies and reverberation-mapped AGNs.