To provide a polyolefin resin composition excellent in a processing cycle and mechanical characteristics, and causing little deformation in molding, that is, little deformation due to the anisotropy of a shrinkage rate.

The polyolefin resin composition comprises: (A) 100 pts.mass of a polyolefin resin; and (B) 0.01-10 pts.mass of, preferably 0.05-5 pts.mass of, a compound represented by formula (I). If necessary, a phenolic, phosphorus, thioether, or hydroxylamine antioxidant, an UV absorber, a hindered amine light stabilizer, or another nucleator may be contained. Preferably, polypropylene is used as the polyolefin resin.