Cemented carbide and cutting tool including same

A cemented carbide comprising first hard phase grains, second hard phase grains, third hard phase grains, and a metal binder phase, wherein

• each of the first hard phase grains includes tungsten carbide,
• each of the second hard phase grains has a core portion in a form of a grain and a peripheral portion that coats at least a portion of the core portion,
• the core portion is composed of a first composite carbonitride represented by Ti1-X-ZNbXMZC1-YNY,
• the peripheral portion is composed of a second composite carbonitride, the second composite carbonitride being a carbonitride that has a composition different from a composition of the core portion and that at least includes titanium, niobium, and tungsten,
• the M represents at least one element selected from a group consisting of vanadium, chromium, and molybdenum,
• the X is more than or equal to 0.1 and less than or equal to 0.2,
• the Y is more than or equal to 0.3 and less than or equal to 0.6,
• the Z is more than or equal to 0 and less than or equal to 0.02,
• each of the third hard phase grains is composed of the first composite carbonitride,
• the metal binder phase includes an iron group element,
• the cemented carbide has a total of 70 unit regions,
• the total of 70 unit regions are provided by continuously arranging 7 unit regions in a longitudinal direction and 10 unit regions in a lateral direction in an electron microscope image obtained by imaging an arbitrary cross section of the cemented carbide at a magnification of 1500×, each of the unit regions being constituted of a square having each side of 8 μm,
• the number of unit regions each having a percentage of less than 0.43% or more than 2.43% is less than or equal to 10 among the total of 70 unit regions,
• the percentage is a percentage of the total number of the number of the second hard phase grains and the number of the third hard phase grains in each unit region with respect to the total number of the number of the second hard phase grains and the number of the third hard phase grains in the total of 70 unit regions,
• the number of the second hard phase grains in the unit region is the number of second hard phase grains having core portions each having a grain size of more than or equal to 0.2 μm and less than or equal to 3 μm in the unit region,
• the number of the third hard phase grains in the unit region is the number of third hard phase grains each having a grain size of more than or equal to 0.5 μm and less than or equal to 2.5 μm in the unit region, and
• in a total of 10 unit regions existing in a fourth row of the total of 70 unit regions in the longitudinal direction in the cemented carbide, a percentage of the number of the third hard phase grains each having a grain size of more than or equal to 0.5 μm and less than or equal to 2.5 μm with respect to the total number of the number of the second hard phase grains having the core portions each having a grain size of more than or equal to 0.2 μm and less than or equal to 3 μm and the number of the third hard phase grains each having a grain size of more than or equal to 0.5 μm and less than or equal to 2.5 μm is more than or equal to 5% and less than or equal to 15%.