Two samples of amorphous GeO2 were prepared at room temperature by compression of &agr;-quartz type crystals at 13 and 20 GPa. The former sample has a density of 4.42(6) Mg/m3 and the latter 5.34(2) Mg/m3. The elastic wave velocities, &ngr;p and &ngr;s of each sample were measured under pressures up to 4 GPa at room temperature. The results are: (1) Both &ngr;p and &ngr;s are faster in the sample with higher density. (2) Even the velocities of the sample with lower density are faster than those of both &agr;-quartz type crystal and a conventional amorphous phase whose density is less than 4 Mg/m3. Since the pressure derivative of &ngr;p is larger than that of &ngr;s, the difference between &ngr;p and &ngr;s becomes greater with increasing pressure.