It provides a method for producing a Co-based alloy powder, a Co-based alloy sintered body, and a Co-based alloy sintered body capable of providing a Co-based alloy material having mechanical properties equivalent to or higher than that of a precipitation-reinforced Ni-based alloy material. The Co-based alloy powder according to the present invention includes 0.08% by mass or more and 0.25% by mass or less of carbon, 0.1% by mass or less of boron, 10% by mass or more and 30% by mass or less of chromium, and 5% by mass or less of iron, It contains 30 mass% or less nickel, contains so that the total of iron and nickel is 30 mass% or less, contains at least one of tungsten and molybdenum so that the total is 5 mass% or more and 12 mass% or less, titanium, zirconium , At least one of niobium, tantalum, hafnium, and vanadium in a total of 0.5% by mass or more and 2% by mass or less, and 0.5% by mass or less of silicon, 0.5% by mass or less of manganese, and 0.003% by mass or more and 0.04% by mass It is characterized in that it contains the following nitrogen, the balance consists of cobalt and impurities, the crystal grains constituting the cobalt-based alloy powder have segregation cells, and the average size of the segregation cells is 0.15 µm or more and 4 µm or less.
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