An object of the present invention is to provide a powder for additive manufacturing excellent in high-temperature strength, and an additively manufactured article excellent in high-temperature strength produced using the powder for additive manufacturing, and the present invention provides an alloy powder material for additive manufacturing, including: an alloy powder; and oxide nanoparticles that have not been subjected to surface treatment with an organic substance, wherein the oxide nanoparticles are attached to surfaces of alloy particles constituting the alloy powder, and an additively manufactured article produced using the alloy powder material for additive manufacturing.