We started observations of Type Ia supernova (SN) 2011B since Jan. 9. This object was discovered in nearby galaxy NGC 2655 (m-M=31.45; NED extragalactic database) on Jan. 7 by K. Itagaki and M. Tsuboi, independently. We find that this object is still rising its luminosity in spite of times elapse 16 days after discovery! This means that this SN would be one of the ealiest discovered SNe Ia. We will continue the observations of this SN.