A lubricating grease composition comprising: a thickener which is a mixed thickener comprising a mixture of (a), (b), and (c): (a) one or more diurea compounds which are one or more aliphatic diurea compounds having an average molecular weight of 500-750 in which 10-70% by mole of the linear hydrocarbon groups are unsaturated components, the aliphatic diurea compounds having been produced using as a raw material one or more primary amines having a total amine value in the range of 200-400 mgKOH/g, (b) at least one fatty acid metal salt, and (c) at least one amide compound selected from the group consisting of aliphatic amides and aliphatic bisamides represented by formulae and R 1 CONH 2 R 1 CONHR 2 NHCOR 1 wherein R 1 represents a saturated or unsaturated alkyl group having 15-17 carbon atoms and R 2 represents a methylene group or an ethylene group, the proportions of (a) and of (b) and (c) satisfying the relationship: a / b + c = 0.2 - 10 provided that the proportion of ingredient (a) is 1-10, the proportion of ingredient (b) is 0.5-2.5, and the proportion of ingredient (c) is 0.5-2.5, the amount of the thickener being 2-30% by weight, based on the whole composition; the composition further comprising: (d) a base oil which is a lube base oil having a pour point of -25°C or lower and comprising a synthetic hydrocarbon oil as the main component of the base oil in an amount of 80% by weight or more among the base oil; and (e) an additive which is a mixture comprising an organomolybdenum complex, an organozinc compound of a dithiocarbamic acid, and an organozinc compound of dithiophosphoric acid, the amount of the additive being 1-7% by weight, based on the whole composition. a thickener which is a mixed thickener comprising a mixture of (a), (b), and (c): (a) one or more diurea compounds which are one or more aliphatic diurea compounds having an average molecular weight of 500-750 in which 10-70% by mole of the linear hydrocarbon groups are unsaturated components, the aliphatic diurea compounds having been produced using as a raw material one or more primary amines having a total amine value in the range of 200-400 mgKOH/g, (b) at least one fatty acid metal salt, and (c) at least one amide compound selected from the group consisting of aliphatic amides and aliphatic bisamides represented by formulae and R 1 CONH 2 R 1 CONHR 2 NHCOR 1 wherein R 1 represents a saturated or unsaturated alkyl group having 15-17 carbon atoms and R 2 represents a methylene group or an ethylene group, (a) one or more diurea compounds which are one or more aliphatic diurea compounds having an average molecular weight of 500-750 in which 10-70% by mole of the linear hydrocarbon groups are unsaturated components, the aliphatic diurea compounds having been produced using as a raw material one or more primary amines having a total amine value in the range of 200-400 mgKOH/g, (b) at least one fatty acid metal salt, and (c) at least one amide compound selected from the group consisting of aliphatic amides and aliphatic bisamides represented by formulae and R 1 CONH 2 R 1 CONHR 2 NHCOR 1 wherein R 1 represents a saturated or unsaturated alkyl group having 15-17 carbon atoms and R 2 represents a methylene group or an ethylene group, the proportions of (a) and of (b) and (c) satisfying the relationship: a / b + c = 0.2 - 10 provided that the proportion of ingredient (a) is 1-10, the proportion of ingredient (b) is 0.5-2.5, and the proportion of ingredient (c) is 0.5-2.5, the amount of the thickener being 2-30% by weight, based on the whole composition; the composition further comprising: the proportion of ingredient (a) is 1-10, the proportion of ingredient (b) is 0.5-2.5, and the proportion of ingredient (c) is 0.5-2.5, (d) a base oil which is a lube base oil having a pour point of -25°C or lower and comprising a synthetic hydrocarbon oil as the main component of the base oil in an amount of 80% by weight or more among the base oil; and (e) an additive which is a mixture comprising an organomolybdenum complex, an organozinc compound of a dithiocarbamic acid, and an organozinc compound of dithiophosphoric acid, the amount of the additive being 1-7% by weight, based on the whole composition.