The invention has an object to provide a rubber composition for tire with improved processability and abrasion resistance. The invention relates to a rubber composition for tire, comprising: (a) 5-90 weight parts of a high cis polybutadiene having a cis structure in a proportion of 95 wt % or higher in a microstructure analysis; (b) 90-5 weight parts of a diene-based rubber other than (a); and (c) 1-100 weight parts of a reinforcing agent blended in 100 weight parts of a rubber component including (a)+(b). The high cis polybutadiene is synthesized using a cobalt-based catalyst and satisfies the requirements of: (i) a Mooney viscosity (ML) of 40-49; (ii) a molecular weight distribution [Weight average molecular weight (Mw)/Number average molecular weight (Mn)] of 3.0-3.9; and (iii) a velocity dependence index (n-value) of the Mooney viscosity of 2.3-3.0.