SLIDE MEMBER AND BEARING UTILIZING THE SAME

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A sliding member includes a silicon nitride sintered compact containing a rare earth element of 7 to 18 mass % in terms of oxide and at least one element M selected from Ti, Zr, Hf, V, Nb, Ta, Cr, Mo and W of 0.1 to 3 mass % in terms of oxide, and having a total content of impurity positive ion elements of 0.3 mass % or less and a thermal conductivity of 60 W/m·K or higher. The silicon nitride sintered compact includes silicon nitride crystal grains and a grain boundary phase, and has a ratio of crystalline compound phases in the grain boundary phase of 20% or more in area ratio, and an average grain size of the crystalline compound phases of 0.5 μm or less. The sliding member is used, for example, as a bearing ball 2.