  We investigate the correlation between the mass of the supermassive black
holes (SMBHs) and metal abundance, using existing data sets. The SMBH mass
$M_{bh}$ is well correlated with integrated stellar feature of Mgb. For 28
galaxies, the best-fit $M_{bh}$-Mgb relation has a small scatter, which is an
equivalent level with other well-known relation, such as a correlation between
the stellar velocity dispersion and the mass. An averaged iron index $<$Fe$>$
also positively correlates with $M_{bh}$, but the best-fit $M_{bh}$-$<$Fe$>$
relation has a larger scatter. The difference comes from the synthesis and
evolution mechanisms, and may be important for the SMBH and star formation
history in the host spheroid.
