your ID: 0082 First Name: Suganuma Last Name: Masahiro Affiliation: National Astronomical Observatory of Japan Title: Reverberation Measurements of the Inner Radius of the Dust Torus in Nearby Seyfert 1 Galaxies Authors: Suganuma, M., Yoshii, Y., Kobayashi, Y., Minezaki, T., Enya, K., Tomita, H., Aoki, T., Koshida, S., and Peterson, B. A. Topic: 6 Session: oral Abstract: We detected clear time-delayed responses of the K-band flux variations to the V-band flux variations for several nearby Seyfert 1 galaxies from monitoring observations by MAGNUM telescope. The lag time can be interpreted as light-travel time between the central engine and the inner edge of the dust torus, which found to be scaled by square root of the central luminosity and locate on the upper boundary of those of the BLR.