In many small hydroelectric power, foreign matter obstruction is likely to occur because they use a runner with multiple blades. Therefore, the authors are considering using a single-blade centrifugal pump as a reverse running turbine. However, excessive radial thrust occurs by geometrically non-axisymmetric shape. Since previous studies have shown that the blade outlet angle has a significant influence on the fluctuation components of radial thrust in pump mode, this study investigated the effect of the blade inlet angle on radial thrust by experiment and CFD. As a result, increasing the blade inlet angle improved the turbine efficiency from the small flow rate to the middle flow rate, but the head coefficient increased on the large flow side and the turbine efficiency dropped rapidly. Even if the flow rate changes, the effect of the blade inlet angle on the time-averaged value of radial thrust is relatively small. On the other hand, the fluctuation component of the radial thrust increased on the small flow side as the blade inlet angle was large, but decreased from the medium flow rate to the large flow rate.