Cemented carbide and cutting tool

A cemented carbide comprising a hard phase and a binder phase, wherein

• the hard phase has first hard phase grains and second hard phase grains,
• each of the first hard phase grains is composed of tungsten carbide,
• a second hard phase grain includes a core portion and a rim portion that covers at least a portion of the core portion,
• a composition of the core portion is represented by M1x1W1-x1C1-yNy1,
• the M1 is at least one metal element selected from a group consisting of a group 4 element, a group 5 element in a periodic table, chromium and molybdenum,
• the x1 is 0.70 or more and 1.00 or less,
• the y1 is 0 or more and 0.90 or less,
• a composition of the rim portion is represented by M2x2W1-x2C1-y2Ny2,
• the M2 is at least one metal element selected from a group consisting of a group 4 element, a group 5 element in the periodic table, chromium and molybdenum,
• the x2 is 0.20 or more and less than 0.70,
• the y2 is 0 or more and 0.90 or less,
• the binder phase includes at least one iron group element selected from a group consisting of iron, cobalt, and nickel,
• a 50% cumulative number grain size of the second hard phase grains is 0.01 μm or more and 1.0 μm or less,
• in the cemented carbide, the number of unit regions R in each of which a percentage of the number of the second hard phase grains with respect to a total number of the second hard phase grains in a total of 48 unit regions R is less than 0.5% or is more than 5% is 14 or less among the total of 48 unit regions R, and
• the total of 48 unit regions R are provided by arranging six unit regions R in a longitudinal direction and eight unit regions R in a lateral direction in an electron microscope image of the cemented carbide at an observation magnification of 10000×, each of the unit regions R being in a form of a square having each side of 1.5 μm.