To provide a bearing function evaluating method for simultaneously evaluating various functions of a bearing, especially a pressure-proof performance and a dynamic friction torque.

The bearing function evaluating method can simultaneously evaluate various functions of the bearing in a state that the bearing is rotated. After the bearing 6 to be evaluated is replaceably set to an airtight rotation measuring apparatus, the dynamic friction torque of the bearing is evaluated by measuring power consumption of the rotation measuring apparatus, and the pressure-proof performance of the bearing is evaluated by measuring an air pressure passing through the bearing in a state that the rotation measuring apparatus rotates the bearing and compressed air is variably applied to the bearing.