I will present the low-z BH mass - bulge luminosity relation by analyzing Hubble Space Telescope (HST) archival images for a sample of 237 Type I AGNs.?? I probed the BH-host relation of AGNs by comparing the relation to that of normal galaxies and by investigating the intrinsic scatter of the relation. Also, In order to investigate how the BH-host relation has been established, (1) an estimate of the star formation rate in AGNs and<br /><br />
(2) seeking signs of interactions in AGNs are important. For the former, I measured the strength of [O II] and other optical emission lines from a large sample (∼ 3600) of broad-line (Type 1) AGNs selected from the Sloan Digital Sky Survey. For the latter, I obtained<br /><br />
deep, multi-color ground based images of low-redshift AGNs for which HST images are available. Based on the results, I will discuss how black holes and host galaxies<br /><br />
coevolve.