We have observed 3C 273 in photo and polarimetri mode using TRISPEC since 11, Dec. 2008. We show the data from 21, Oct. 2009. It is reported that the object has Big Blue Bump (BBB) in UV region in SED. BBB is thought to be a thermal emission and radiate from the accretion disk. We can consider that the thermal emission is unpolarized. The polarization degree of the object, thus, is low compared with other blazars. We also consider that the thermal emission should not vary rapidly. The light curve of the object has been less variable, delta(V) < 0.2.