The design of the fatigue life of a rolling bearing is based on the Lundberg-Palmgren theory. This theory suggests that the fatigue life of a rolling bearing is influenced by the size of the volume under shear stress. Thus, a rolling bearing with small balls is expected to display a different fatigue life from one with larger balls, even if their maximum contact pressures are the same. The reason for this difference is that the volumes that are under the shear stress between different-sized bearings are different. However, when the contact equivalent radius of a rolling bearing is 1 mm or less, there is no confirmation whether its fatigue life can be designed according to the Lundberg-Palmgren theory. For this reason, the fatigue life of ball bearings with small balls is measured under a fluid lubricating condition. The results obtained are as follows. 1) The difference in ball size is not a significant influence on the fatigue life of the ball bearing. 2) The rolling fatigue life of a rolling bearing with small balls, as well as rolling bearings with typical sized balls, can be designed using the conventional method.%（1）議事録の作成rn議事轟の作成を，議長並びに出席理事木村理事，佐分理事を承認した．rn（2）平成23年度事業報告，同貸借対照表，姐益計算書および年度末財産目錦の件原案を全月異議な〈全会一致で承認した．
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