A powder material for powder additive manufacturing, the powder material having a flow function of 5.5 or greater and comprising: particles having a form of secondary particles, the secondary particles formed with primary particles bound three-dimensionally with interspaces, wherein the secondary particles are granulated sintered particles obtainable by spherical granulation and sintering of the primary particles, wherein the powder material is formed of at least one species of material selected from the group consisting of metal materials, ceramic materials and cermets, wherein the secondary particles account for 90 % by mass or more of the powder material, wherein the powder material may comprise particles having other forms besides that of the secondary particles, wherein purities of the primary and secondary particles are preferably 95 % by mass or higher, wherein the powder material may further include transition metals and elements such as Na, K and Rb, wherein the flow function is determined by analyzing the powder material as specified in the description, wherein the remainder of the powder material is constituted of inevitable impurities and additives, wherein the secondary particles have an average particle diameter of 1 μm or larger and 100 μm or smaller, wherein the average particle diameter is the 50 th percentile particle diameter in its size distribution by volume measured by a particle size analyzer based on laser diffraction/scattering spectroscopy, wherein the compressive strength of the secondary particles forming the powder material is in a range from 1 MPa to 1000 MPa, wherein the compressive strength values are determined by measuring 10 secondary particles for each powder material using a micro compression tester MCTE·500 and determining the arithmetic mean value of the resulting compressive strength values, wherein the compressive strength σ in MPa is determined by equation σ = 2.8 × L / π / d 2 wherein L is the critical load in N and d is the average secondary particle diameter in mm. particles having a form of secondary particles, the secondary particles formed with primary particles bound three-dimensionally with interspaces, wherein the secondary particles are granulated sintered particles obtainable by spherical granulation and sintering of the primary particles, wherein the powder material is formed of at least one species of material selected from the group consisting of metal materials, ceramic materials and cermets, wherein the secondary particles account for 90 % by mass or more of the powder material, wherein the powder material may comprise particles having other forms besides that of the secondary particles, wherein purities of the primary and secondary particles are preferably 95 % by mass or higher, wherein the powder material may further include transition metals and elements such as Na, K and Rb, wherein the flow function is determined by analyzing the powder material as specified in the description, wherein the remainder of the powder material is constituted of inevitable impurities and additives, wherein the secondary particles have an average particle diameter of 1 μm or larger and 100 μm or smaller, wherein the average particle diameter is the 50 th percentile particle diameter in its size distribution by volume measured by a particle size analyzer based on laser diffraction/scattering spectroscopy, wherein the compressive strength of the secondary particles forming the powder material is in a range from 1 MPa to 1000 MPa, wherein the compressive strength values are determined by measuring 10 secondary particles for each powder material using a micro compression tester MCTE·500 and determining the arithmetic mean value of the resulting compressive strength values, wherein the compressive strength σ in MPa is determined by equation σ = 2.8 × L / π / d 2 wherein L is the critical load in N and d is the average secondary particle diameter in mm. <EOS>