Cemented carbide and cutting tool

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

• the first phase consists of a plurality of tungsten carbide particles;
• the content of the first phase in the cemented carbide is 65% by volume or more and 85% by volume or less;
• the second phase consists of cobalt;
• the cobalt content C5 in the cemented carbide is 3% by mass or more and 15% by mass or less;
• the third phase consists of at least one element selected from the group consisting of titanium, tantalum, niobium, zirconium and tungsten, and at least any of carbon and nitrogen;
• the third phase comprises no tungsten carbide;
• the total content C of titanium, tantalum, niobium and zirconium in the cemented carbide is 2% by mass or more and 8% by mass or less;
• the Vickers hardness a of the cemented carbide is 12.5 GPa or more and 14.5 GPa or less;
• the Vickers hardness a is measured for the cemented carbide at a point P1 where the distance from the surface of the cemented carbide along the normal direction of the surface is 5 μm;
• the Vickers hardness c is measured for the cemented carbide at a point at point P4 where the distance from the surface along the normal direction of the surface is 200 μm;
• the cemented carbide includes a first region sandwiched between a virtual plane Q1 having a distance of 5 μm from the surface and a virtual plane Q4 having a distance of 200 μm from the surface;
• the first region has a second region sandwiched between a virtual plane Q2 having a distance of 10 μm from the surface and a virtual plane Q3 having a distance of 50 μm from the surface;
• in the first region, a point P2 indicating the Vickers hardness b, which is the maximum value of the Vickers hardness, exists in the second region;
• the difference b-a between the Vickers hardness b and the Vickers hardness a is 1.8 GPa or more;
• and
• in the cemented carbide, the difference b-c between the Vickers hardness b and the Vickers hardness c is 0.3 GPa or more and 1.0 GPa or less, wherein the Vickers hardness decreases from the point P2 to the point P4.