[en] Fatigue fractures caused by high-cycle fatigue with thermal-striping or flow induced vibration have been occurred recently. For this reason, the importance of high-cycle fatigue life evaluation has been recognized. In this study, the high-cycle fatigue behavior was evaluated based on the results of high-cycle fatigue test up to 10⁸ cycles at elevated temperature on Type 304 stainless steel, and the effect of notch on the high-cycle fatigue lives were investigated, too. The tests were carried out at 500degC under a load control mode with frequency set at 30Hz. The results obtained from this study are as follows. (1) The date of high-cycle fatigue properties were obtained in the range below 10⁸ cycles at 500degC. (2) It is considered that the fatigue limit exists from the examination results in the range up to 10⁸ cycles on smooth fatigue specimen. The internal fatigue fracture wasn't observed in the high-cycle region. (3) The fatigue lives increased with decreasing stress range below 10⁸ cycles on notch specimen. The fatigue lives that calculated from the specimen shape were conservatively evaluated at 10⁸ cycles. (4) Fracture that affect of stationary crack was observed near the crack initiation point on the notch specimen in the high-cycle region. (author)