The effect of surface texture on frictional behavior at EHL to boundary lubrication conditions has been widely studied. However, detailed relationship between lubricant film thickness and friction change has not been fully understood and optimal geometry of surface texture for improving frictional behavior has yet to be clarified. To elucidate the effect of surface texture on frictional behavior, in-situ measurement of frictional properties and lubricant film thickness is required. In this study, we developed a ball-on-disk friction apparatus equipped with ultra-thin film reflectometry which enables accurate in-situ measurement of lubricant film thickness with wide sliding speed range and investigated the effect of a dimple-shaped and groove surface texture. In this presentation, we report the results of a dimple-shaped and groove surface texture on frictional behavior and lubricant film thickness.