Cemented carbide and cutting tool

A cemented carbide comprising a first phase and a second phase, wherein

• the first phase consists of a plurality of tungsten carbide grains,
• a content ratio of the first phase of the cemented carbide is 65 volume % or more and 85 volume % or less,
• a content ratio of the second phase of the cemented carbide is 4 volume % or more and 25 volume % or less,
• the second phase includes 50 mass % or more of cobalt,
• the second phase includes zirconium,
• a cobalt content ratio MCo of the cemented carbide is 3 mass % or more and 15 mass % or less,
• a and b of the cemented carbide indicate a relation of the following formula I:
• b<0.0485a+0.0001 Formula I, where
• the a represents a percentage, (MZr/MCo)×100, of a zirconium content ratio MZr of the cemented carbide in mass % with respect to the cobalt content ratio MCo of the cemented carbide in mass %,
• the a is more than 0 and 8 or less,
• the b represents an area percentage of pore in a first region of a cross section of the cemented carbide, and
• the first region is a region located within a distance of 50 μm from a surface of the cemented carbide in the cross section.