A cemented carbide comprising of 80% by mass or more a hard phase, wherein the hard phase contains tungsten carbide particles at a ratio of 50 % by mass or more and a binder phase at a ratio of 4 % by mass or more, the binder phase containing, as a main component, an iron-group element, characterized in that the formula B/A ≤ 0.05 is satisfied, where A represents the number of the tungsten carbide particles in an observation plane, and B represents the number of tungsten carbide particles in the observation plane whose number of contact points with other tungsten carbide particles is 1 or less, the observation plane being within a surface or a cross section of the cemented carbide; wherein a contact point refers to a portion where tungsten carbide particles are in contact with each other without the binder phase therebetween in a planar structure of the cemented carbide; as long as a tungsten carbide particle is continuously in contact with an adjacent tungsten carbide particle, the number of contact points is considered to be one regardless of the size thereof, and the contact point number is measured for each tungsten carbide particle; the contact point number is measured by mirror-finishing any surface or any cross section of the cemented carbide to obtain the observation plane, and observing the observation plane with a microscope to obtain an observation image, image analysis using the observation image and a composition distribution image obtained by analysis with energy dispersive X-ray spectroscopy, classifying hard phase particles into tungsten carbide particles and hard phase particles other than tungsten carbide particles, and after the classification, visually counting the contact point number of each tungsten carbide particle; the number of particles of tungsten carbide particles per field of view of the observation image is 450 to 550; and the ratio B/A is determined by measuring ratios B/A of a plurality of fields of view and using the average value of the measured ratios B/A of the fields of view. a contact point refers to a portion where tungsten carbide particles are in contact with each other without the binder phase therebetween in a planar structure of the cemented carbide; as long as a tungsten carbide particle is continuously in contact with an adjacent tungsten carbide particle, the number of contact points is considered to be one regardless of the size thereof, and the contact point number is measured for each tungsten carbide particle; the contact point number is measured by mirror-finishing any surface or any cross section of the cemented carbide to obtain the observation plane, and observing the observation plane with a microscope to obtain an observation image, image analysis using the observation image and a composition distribution image obtained by analysis with energy dispersive X-ray spectroscopy, classifying hard phase particles into tungsten carbide particles and hard phase particles other than tungsten carbide particles, and after the classification, visually counting the contact point number of each tungsten carbide particle; mirror-finishing any surface or any cross section of the cemented carbide to obtain the observation plane, and observing the observation plane with a microscope to obtain an observation image, image analysis using the observation image and a composition distribution image obtained by analysis with energy dispersive X-ray spectroscopy, classifying hard phase particles into tungsten carbide particles and hard phase particles other than tungsten carbide particles, and after the classification, visually counting the contact point number of each tungsten carbide particle; the number of particles of tungsten carbide particles per field of view of the observation image is 450 to 550; and the ratio B/A is determined by measuring ratios B/A of a plurality of fields of view and using the average value of the measured ratios B/A of the fields of view.