An iron-base sintered alloy material for a valve seat insert having excellent wear-resistance, the iron-base sintered alloy material comprising a matrix part including (i) a matrix phase formed from an iron-based powder, (ii) first hard-particles and (iii) second hard-particles, wherein: the iron-base sintered alloy material contains 2 to 45% by mass of the first hard-particles and 2 to 30% by mass of the second hard-particles, has a density of 6.6 g/cm 3 or more, and has a radial crushing strength of 350 MPa or more, as determined in accordance with JIS Z 2507, the first hard-particles and the second hard-particles have different hardness and are dispersed in the matrix phase, the matrix phase containing the two types of hard-particles in a total amount of 10 to 50% by mass, the first hard-particles are cobalt-dispersed, inter-metallic compound particles having a Vickers hardness of 600 to 1200 HV, as determined in accordance with JIS Z 2244 under a load of 50 gf, and containing 20 to 60% by mass of Mo, 1 to 10% by mass of Si, and 5 to 70% by mass in total of one or more kinds selected from Cr, Ni, and Fe, the balance being Co and unavoidable impurities, the second hard-particles are high-speed tool steel-based, carbide-containing particles having a Vickers hardness of 400 to 700 HV, as determined in accordance with JIS Z 2244 under a load of 50 gf, and containing 0.5 to 1.5% by mass of C, 0.2 to 0.5% by mass of Si, 0.1 to 0.5% by mass of Mn, 2 to 6% by mass of Cr, 3 to 7% by mass of Mo, 4 to 8% by mass of W, and 1 to 3% by mass of V, the balance being Fe and unavoidable impurities, and the matrix part contains 0.3 to 1.5% by mass of C and 10 to 50% by mass in total of one or more kinds selected from Si, Mo, Cr, Ni, Co, Mn, S, W, V, Ca, F, Mg, and O, the balance being Fe and unavoidable impurities. the iron-base sintered alloy material contains 2 to 45% by mass of the first hard-particles and 2 to 30% by mass of the second hard-particles, has a density of 6.6 g/cm 3 or more, and has a radial crushing strength of 350 MPa or more, as determined in accordance with JIS Z 2507, the first hard-particles and the second hard-particles have different hardness and are dispersed in the matrix phase, the matrix phase containing the two types of hard-particles in a total amount of 10 to 50% by mass, the first hard-particles are cobalt-dispersed, inter-metallic compound particles having a Vickers hardness of 600 to 1200 HV, as determined in accordance with JIS Z 2244 under a load of 50 gf, and containing 20 to 60% by mass of Mo, 1 to 10% by mass of Si, and 5 to 70% by mass in total of one or more kinds selected from Cr, Ni, and Fe, the balance being Co and unavoidable impurities, the second hard-particles are high-speed tool steel-based, carbide-containing particles having a Vickers hardness of 400 to 700 HV, as determined in accordance with JIS Z 2244 under a load of 50 gf, and containing 0.5 to 1.5% by mass of C, 0.2 to 0.5% by mass of Si, 0.1 to 0.5% by mass of Mn, 2 to 6% by mass of Cr, 3 to 7% by mass of Mo, 4 to 8% by mass of W, and 1 to 3% by mass of V, the balance being Fe and unavoidable impurities, and the matrix part contains 0.3 to 1.5% by mass of C and 10 to 50% by mass in total of one or more kinds selected from Si, Mo, Cr, Ni, Co, Mn, S, W, V, Ca, F, Mg, and O, the balance being Fe and unavoidable impurities.