Shock absorber lubricant composition, shock absorber, and method for adjusting frictional property of shock absorber lubricant

A method of adjusting frictional property of a lubricant composition for shock absorbers containing a base oil and pentaerythritol esters, comprising the step of:

• adjusting a mixing ratio of pentaerythritol tetraester in the pentaerythritol esters to be 40% or more, thereby adjusting the frictional property of a lubricant composition for shock absorbers based on responsiveness RI and an average frictional force Fave at the time of minute amplitude so that the responsiveness RI relative to the average frictional force Fave is higher, supposing that the responsiveness RI is a ratio ({Fsa−Fave}/Fave) of a difference between a peak frictional force Fsa and the average frictional force Fave in transition from a stationary state to a sliding state at the time of minute amplitude to the average frictional force Fave at the time of minute amplitude.