Lubricating-oil base oil, method for producing same, and electrically insulating oil

A method for producing a lubricating base oil, the method comprising:

• a first step of subjecting a synthetic wax obtained by a gas-to-liquid process, or a lubricating fraction separated from the synthetic wax, to hydrocracking, thereby obtaining a hydrocracked oil having a normal paraffin content of 30% or greater and 50% or less;
• and
• a second step of subjecting the hydrocracked oil to hydroisomerization dewaxing in the presence of a hydroisomerization catalyst, thereby obtaining a lubricating base oil;
• wherein the lubricating base oil has a volume resistivity at 80° C. of 1 TΩ·m or greater, and
• a volume resistivity at 25° C. relative to the volume resistivity at 80° C. that satisfies conditions represented by the following formula (1):
• B(25° C.)/A(80° C.)≧1.5 (1)
• wherein in formula (1), A (80° C.) indicates the volume resistivity at 80° C. of the lubricating base oil, and B (25° C.) indicates the volume resistivity at 25° C. of the lubricating base oil.