A lubricant base oil that is a hydrocarbon oil that satisfies any of the following conditions (ii) and (iii): (ii) a kinematic viscosity at 100°C of 5 to 9 mm 2 /s as measured in conformity with JIS K 2283-1993, a viscosity index of 155 or more as measured in conformity with JIS K 2283-1993, a freezing point of -15 to -5°C, and an SBV viscosity at -20°C of 3,000 to 30,000 mPa·s determined in conformity with ASTM D5133, wherein the freezing point of the lubricant base oil is higher by 10°C or more than a freezing point of raffinate obtained by bringing the lubricant base oil into contact with urea and removing paraffin that can be included in the urea, wherein in the case of performing a 13 C-NMR analysis of the lubricant base oil, a rate of CH 2 carbons constituting the main chain to all carbons constituting the lubricant base oil is 20% or more, with 13 C-NMR analysis being performed under the following conditions: a diluted sample obtained by adding 3 g of deuterated chloroform to 0.5 g of a sample is used, the measurement temperature is room temperature, the resonant frequency is 100 MHz, and a gated coupling method is used, (iii) a hydrocarbon oil having a kinematic viscosity at 100°C of 2.0 to 3.0 mm 2 /s as measured in conformity with JIS K 2283-1993, a viscosity index of 130 or more as measured in conformity with JIS K 2283-1993, a freezing point of -30 to -10°C, and an SBV viscosity at -30°C of 1,000 to 30,000 mPa·s determined in conformity with ASTM D5133, wherein the freezing point of the lubricant base oil is higher by 15°C or more than a freezing point of raffinate obtained by bringing the lubricant base oil into contact with urea and removing paraffin that can be included in the urea, wherein in the case of performing a 13 C-NMR analysis of the lubricant base oil, a rate of CH 2 carbons consisting the main chain to all carbons constituting the lubricant base oil is 15% or more, with 13 C-NMR analysis being performed under the following conditions: a diluted sample obtained by adding 3 g of deuterated chloroform to 0.5 g of a sample is used, the measurement temperature is room temperature, the resonant frequency is 100 MHz, and a gated coupling method is used. (ii) a kinematic viscosity at 100°C of 5 to 9 mm 2 /s as measured in conformity with JIS K 2283-1993, a viscosity index of 155 or more as measured in conformity with JIS K 2283-1993, a freezing point of -15 to -5°C, and an SBV viscosity at -20°C of 3,000 to 30,000 mPa·s determined in conformity with ASTM D5133, wherein the freezing point of the lubricant base oil is higher by 10°C or more than a freezing point of raffinate obtained by bringing the lubricant base oil into contact with urea and removing paraffin that can be included in the urea, wherein in the case of performing a 13 C-NMR analysis of the lubricant base oil, a rate of CH 2 carbons constituting the main chain to all carbons constituting the lubricant base oil is 20% or more, with 13 C-NMR analysis being performed under the following conditions: a diluted sample obtained by adding 3 g of deuterated chloroform to 0.5 g of a sample is used, the measurement temperature is room temperature, the resonant frequency is 100 MHz, and a gated coupling method is used, (iii) a hydrocarbon oil having a kinematic viscosity at 100°C of 2.0 to 3.0 mm 2 /s as measured in conformity with JIS K 2283-1993, a viscosity index of 130 or more as measured in conformity with JIS K 2283-1993, a freezing point of -30 to -10°C, and an SBV viscosity at -30°C of 1,000 to 30,000 mPa·s determined in conformity with ASTM D5133, wherein the freezing point of the lubricant base oil is higher by 15°C or more than a freezing point of raffinate obtained by bringing the lubricant base oil into contact with urea and removing paraffin that can be included in the urea, wherein in the case of performing a 13 C-NMR analysis of the lubricant base oil, a rate of CH 2 carbons consisting the main chain to all carbons constituting the lubricant base oil is 15% or more, with 13 C-NMR analysis being performed under the following conditions: a diluted sample obtained by adding 3 g of deuterated chloroform to 0.5 g of a sample is used, the measurement temperature is room temperature, the resonant frequency is 100 MHz, and a gated coupling method is used.