The time averaged characteristics of hydraulic jump such as a conjugate depth and the length of hydraulic jump have been almost clarified. The time averaged pressure distributions around the end sill are also measured by several researchers. On the other hand, bed materials near the roller of hydraulic jump are sometimes picked up by the pressure fluctuations, so that it is quite important to investigate on characteristics of the pressure fluctuations in and around the hydraulic jump. In this study, the pressure fluctuations on the bed wall in and around roller were measured with pressure gauges. Further, free surface fluctuations were also measured with supersonic wave gauges, simultaneously. It was found that the strength of the pressure fluctuations on the bed wall takes maximum at the toe of the roller. The values of the time averaged pressure are less than those of hydrostatic pressure and this tendency becomes more remarkable with an increase of the Froude numbers.
