Cemented carbide and mold for ultra-high pressure generating device using the same

A cemented carbide comprising:

• a first phase being composed of a plurality of tungsten carbide grains;
• and
• a plurality of discontinuous second phases containing cobalt,
• wherein:
• the cemented carbide contains chromium and vanadium,
• a mass-based percentage of the chromium to the cobalt is 5% or more and 9% or less,
• a mass-based percentage of the vanadium to the cobalt is 2% or more and 5% or less,
• an area ratio of the plurality of discontinuous second phases is 7.5 area % or more and 13.5 area % or less,
• a number of the plurality of discontinuous second phases is 1000 or more, and
• the area ratio of the plurality of discontinuous second phases and the number of the plurality of discontinuous second phases are measured in a measurement field of 101 μm2 by performing image processing on a scanning electron microscope image of a cross section of the cemented carbide.