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In order to evaluate our developing 3D directional borehole radar system, ReflexTracker, we carried out an experimental study for detection of foundation piles with the diameter of 350 mm buried in poor subsoil in Tokyo area. Though we collected the existing drawing and specification that well described piles'information at the site such as their materials, structures and locations, we conducted GPR and vertical differential magnetic surveys to confirm the exact location of the pile head. Then, we made the omni-directional and directional borehole radar measurements in a vertical and a 60 degree tilted boreholes. The measurements were successfully implemented for the both boreholes. The estimated 3D locations of the reflected points are in good agreement with the existing pile location with the accuracy of 0.14 to 0.20 m from the pile for measurements by the vertical and the titled boreholes, respectively.