Lubricant composition

To provide a lubricant having both exceptional shear stability and low-temperature viscosity characteristics from the standpoint of fuel economy and energy savings in automobiles and industrial machinery. A lubricant composition containing (A) a lubricant base oil having a kinematic viscosity of 1-10 mm2/s at 100 DEG C, and (B) an ethylene-alpha-olefin copolymer having (B1) a peak top molecular weight of 3,000-10,000, (B2) no melting peak, (B3) a B value of 1.1 or higher, and (B4) a kinematic viscosity of 140-500 mm2/s at 100 DEG C, the lubricant composition having a kinematic viscosity of 20 mm2/s or lower at 100 DEG C and a peak top at a molecular weight of 3,000-10,000, the weight fraction of components having a molecular weight of 20,000 with respect to high-molecular-weight components having at least the molecular weight giving this peak top being 1-10%. 从汽车、工业用机械的节省燃耗·节约能源的观点考虑，本发明的课题在于提供兼具极其优异的剪切稳定性和低温粘度特性的润滑油。本发明的润滑油组合物含有：润滑油基础油(A)，所述润滑油基础油(A)在100℃时的运动粘度为1～10mm/s；和乙烯-α-烯烃共聚物(B)，所述乙烯-α-烯烃共聚物(B)具有以下的(B1