TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The low-corrosive ionic liquid contains nitrogen compound of 0.001-10 mass%. Preferred Components: The ionic liquid of low-corrosive ionic liquid is a mixture of 2 or more ionic liquids. The ionic liquid is of formula: (Z(power)(p+))k(A(power)(q-))m (1).Z(power)(p+)=Z+, preferably R4-N+(-R1)(-R3)-R2, R4-P+(-R1)(-R3)-R2, R1-S+(-R2)-R3 or cations of formula (2-8);R1-R12=H, 1-18C alkyl optionally having ether linkage and/or hydroxyl, 3-18C alkenyl, 6-18C aryl, 7-18C aralkyl or trialkyl silylmethyl;A(power)(q-)=A-, which is BF4-, PF6-, CnH(2n+1)OSO3-, (CnF(2n+1-x)Hx)SO3-, ((CnF(2n+1-x)Hx)SO2)2N-,(CnF(2n+1-x)Hx)COO-, NO3-, CH3SO3-, (CN)2N-, HSO3-, C6H5SO3-, CH3(C6H4)SO3-, (FSO2)2N-, PF6-y(CnF2n-1)y-, BF4-z(CnF2n-1)z-, FeCl4-, (CN)4-zBFz or group of formula (12-14);R13-R20=H or 1-18C alkyl optionally having ether linkage and/or hydroxyl group;p,q,k,m,px k,qx m=1-3;px k=qx m;n=1-8;x=0-17;y=1-6;andz=0-4.Preferred Property: The ionic liquid has pour point of -10 degrees C or less. Preferred Compound: The nitrogen compound is an aliphatic compound having 2 or more nitrogen atoms, or heterocyclic compound containing nitrogen atom(s) as hetero atoms, preferably compound of formula (15-20) or R22-N(-R21)-(CH2)t-N(-R23)-R24, more preferably aminoalkyl imidazole, aminopyridine, aminoalkyl pyridine, N-aminoalkyl piperazine or aminoalkyl amine.R21-R25=H, amino, 1-18C alkyl, 3-18C alkenyl, 6-18C aryl, 7-18C aralkyl, 1-18C aminoalkyl, 1-18C alkylamino or 1-18C hydroxyalkyl;andt=1-18.R21-R25 couples with carbon or nitrogen, can be halo coupled with carbon. EXAMPLE - 1-Ethyl-3-methyl imidazolium bromide (in g) (50) was melted in water (50), lithium bistrifluoromethane sulfonylamide (75) was added and stirred for 30 minutes. Then, chloroform (50) was added, extracted, organic layer was evaporated under reduced pressure, washed and dried, to obtain 1-ethyl-3-methyl imidazolium bis(trifluoromethanesulfonyl) imide (86). 1-Propyl-3-methyl imidazolium bromide (50) was melted in water (50), lithium bistrifluoromethane sulfonylamide (75) was added and stirred for 30 minutes. Then, chloroform (50) was added, extracted, organic layer was evaporated under reduced pressure, washed and dried, to obtain 1-propyl-3-methyl imidazolium bis(trifluoromethanesulfonyl) imide (84). 1-Ethyl-3-methyl imidazolium bis(trifluoromethanesulfonyl) imide (in mass%) (81), 1-propyl-3-methyl imidazolium bis(trifluoromethanesulfonyl) imide (18.9) and N-aminoethyl piperazine (0.1) were blended, to obtain ionic liquid. The obtained ionic liquid had excellent corrosion resistance, high ionic conductivity and low viscosity. The lubricant composition formed using the obtained ionic liquid had excellent heat resistance and low-temperature fluidity.