National Institute of Information and Communications Technology is operating a W-band (95.04GHz) cloud profiling radar called SPIDER. In 2003 and 2004, vertically pointing observations of SPIDER from the ground are made at Tokyo, Japan. Non-hydrometer echoes were frequently observed from the surface to the altitude of 1.2 km in summer and 0.5 km in winter. The height ranges of the echoes show diurnal change: maximum in the noon and minimum in night. Their Doppler speeds show large variability in daytime and small variability in night, which seems to indicate convective activity in boundary layer. Availability of non-hydrometeor echoes for boundary layer study will be discussed in the presentation.