The Japanese fifth X-ray astronomy satellite Suzaku carries the Hard X-ray Detector (HXD) which is installed with 20 BGO crystal scintillation counters for the active shielding. The anti-coincidence counters are available to work as the Wideband All-sky Monitor (WAM), which realize a powerful gamma-ray burst spectrometer covering the 50-5000 keV band. After two month activation operations, the WAM is now in a fully operated, and has succeeded to observe some prompt emissions from GRBs simultaneously with Swift other satellites. In this paper, we report on the WAM inflight performance from initial operations, and present some results, including obtained 100 keV to 1 MeV hard X-ray spectra from GRB051008 and GRB051111.