Cemented carbide and coated cemented carbide

A cemented carbide comprising:

• a hard phase containing tungsten carbide as its main component;
• a binder phase containing an element of at least one kind selected from the group consisting of Co, Ni and Fe as its main component;
• and a composite compound phase, wherein:
• based on total contents of the hard phase, the binder phase and the composite compound phase in the cemented carbide, a content ratio of the hard phase is from 70 volume % or more to 85 volume % or less, a content ratio of the binder phase is from 7.0 volume % or more to 17.0 volume % or less, and a content ratio of the composite compound phase is from 5.0 volume % or more to 15.0 volume % or less;
• the composite compound phase comprises an aggregate;
• the aggregate comprises a small-diameter aggregate having a longest diameter of from 10 μm or more to below 30 μm and a large-diameter aggregate having a longest diameter of 30 μm or more;
• the small-diameter aggregate containing at least one kind from among a carbide, a nitride and a carbonitride of an element of one kind selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Cr and Mo as its main component;
• the large-diameter aggregate containing at least one kind from among a carbide, a nitride and a carbonitride of an element of one kind selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Cr and Mo as its main component;
• a cross-sectional structure of a surface region which ranges inward from a surface of the cemented carbide to a depth of 100 μm satisfies a condition represented by formula (1A) below;
• and
• a cross-sectional structure of an inner region further inward than the surface region satisfies a condition represented by formula (2A) below
• 0.5≤SSDA≤4.0 (1A)
• 1.0≤ILDA≤6.0 (2A)
• SSDA refers to a ratio (unit:area %) of a surface region cross-sectional area of the small-diameter aggregate based on a total cross-sectional area of the composite compound phase,
• ILDA refers to a ratio (unit:area %) of an inner region cross-sectional area of the large-diameter aggregate based on a total cross-sectional area of the composite compound phase.