A soft magnetic powder comprising a chemical composition, excluding inevitable impurities, represented by a composition formula of Fe a Si b B c P d Cu e M f , wherein the M in the composition formula is at least one element selected from the group consisting of Nb, Mo, Zr, Ta, W, Hf, Ti, V, Cr, Mn, C, Al, S, O, and N, 79 at% ≤ a ≤ 84.5 at%, 0 at% ≤ b < 6 at%, 0 at% < c ≤ 10 at%, 4 at% < d ≤ 11 at%, 0.2 at% ≤ e ≤ 0.53 at%, 0 at% ≤ f ≤ 4 at%, a + b + c + d + e + f= 100 at%, a particle size is 1 mm or less, and a median of circularity of particles constituting the soft magnetic powder is 0.4 or more and 1.0 or less, the median of circularity being obtained by using the following equation as described in the description, φ = 4 π A / P 2 where φ : the circularity without unit, A : the projected area of the particle in m 2 , P : the perimeter of each particle of the particle in m, wherein an equivalent number n in the Rosin-Rammler equation represented by the following equation is 0.3 or more and 30 or less, the equivalent number n being measured by using laser particle size distribution meter as described in the description, R = 100 exp − d / c n where d: particle size in m R(%): R: volume ratio of particles having a particle size of d or more in % c: a particle size when R = 36.8 % in m n: equivalent number without unit. the M in the composition formula is at least one element selected from the group consisting of Nb, Mo, Zr, Ta, W, Hf, Ti, V, Cr, Mn, C, Al, S, O, and N, 79 at% ≤ a ≤ 84.5 at%, 0 at% ≤ b < 6 at%, 0 at% < c ≤ 10 at%, 4 at% < d ≤ 11 at%, 0.2 at% ≤ e ≤ 0.53 at%, 0 at% ≤ f ≤ 4 at%, a + b + c + d + e + f= 100 at%, a particle size is 1 mm or less, and a median of circularity of particles constituting the soft magnetic powder is 0.4 or more and 1.0 or less, the median of circularity being obtained by using the following equation as described in the description, φ = 4 π A / P 2 where φ : the circularity without unit, A : the projected area of the particle in m 2 , P : the perimeter of each particle of the particle in m, wherein an equivalent number n in the Rosin-Rammler equation represented by the following equation is 0.3 or more and 30 or less, the equivalent number n being measured by using laser particle size distribution meter as described in the description, R = 100 exp − d / c n where d: particle size in m R(%): R: volume ratio of particles having a particle size of d or more in % c: a particle size when R = 36.8 % in m n: equivalent number without unit. φ : the circularity without unit, A : the projected area of the particle in m 2 , P : the perimeter of each particle of the particle in m, wherein an equivalent number n in the Rosin-Rammler equation represented by the following equation is 0.3 or more and 30 or less, the equivalent number n being measured by using laser particle size distribution meter as described in the description, R = 100 exp − d / c n where d: particle size in m R(%): R: volume ratio of particles having a particle size of d or more in % c: a particle size when R = 36.8 % in m n: equivalent number without unit. d: particle size in m R(%): R: volume ratio of particles having a particle size of d or more in % c: a particle size when R = 36.8 % in m n: equivalent number without unit. <EOS>