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In the designing of bearing to use in internal combustion engines, the author has established an assessment method for needle roller bearing considering the slip ratio of needle rollers when operating. Damages sometimes occur in a bearing when continuously operating the engine although the bearing has a basic dynamic load rating. For an example, flaking occurred in the needle rollers during the continuous operation of the engine when a roller bearing was applied to the bearing that supported the gear which transmitted the driving force from the starter motor to the crankshaft when starting the engine. While the bearing is located on the crankshaft, the bearing is not directly subjected to the loads from engine combustion pressures. We therefore focused our attention on the bearing slip ratio as a factor that affects the bearing rather than the loads.