Compacting of powder of molybdenum was made in an anvil type device of superhigh pressure. The pressure of processing was within the limits of 2.0 - 6.0 GPa. Maximum density (99%) was achieved at 3.6 GPa. The heating to the temperature of 800 C has not changed this parameter. Durability of coupling of separate grain in a sample was estimated qualitatively by micro-hardness measurements. The maximum value of micro-hardness reached 4.000 MPa. The qualitative tendency of the micro-hardness curve is explained in terms of the physical enlargement of the X-Ray lines, received by the Debay-Sherer method.