A producing method for a sulfide solid electrolyte material, comprising: an ion conductive material synthesizing step of synthesizing an ion conductive material not having Li 2 S using a raw material composition containing a constituent of the sulfide solid electrolyte material by mechanical milling of the raw material composition; and a heating step of obtaining the sulfide solid electrolyte material by heating the ion conductive material, characterized by: the raw material composition containing Li 2 S, P 2 S 5, and elemental P; and either by (i) the sulfide solid electrolyte material comprising: a peak at a position of 2θ = 29.86° ± 1.00° in X-ray diffraction measurement using a CuKα ray, and a composition of Li 2y+3 PS 4 (0.1 ≤ y ≤ 0.175), or (ii) the sulfide solid electrolyte material comprising: an octahedron O comprising a Li element and a S element, a tetrahedron T 1 comprising a P element and a S element, and a tetrahedron T 2 comprising a P element and a S element; the tetrahedron T 1 and the octahedron O sharing an edge, and the tetrahedron T 2 and the octahedron O containing a crystal structure sharing a corner, and a composition of Li 2y+3 PS 4 (0.1 ≤ y ≤ 0.175) an ion conductive material synthesizing step of synthesizing an ion conductive material not having Li 2 S using a raw material composition containing a constituent of the sulfide solid electrolyte material by mechanical milling of the raw material composition; and a heating step of obtaining the sulfide solid electrolyte material by heating the ion conductive material, characterized by: the raw material composition containing Li 2 S, P 2 S 5, and elemental P; and either by (i) the sulfide solid electrolyte material comprising: a peak at a position of 2θ = 29.86° ± 1.00° in X-ray diffraction measurement using a CuKα ray, and a composition of Li 2y+3 PS 4 (0.1 ≤ y ≤ 0.175), or (ii) the sulfide solid electrolyte material comprising: an octahedron O comprising a Li element and a S element, a tetrahedron T 1 comprising a P element and a S element, and a tetrahedron T 2 comprising a P element and a S element; the tetrahedron T 1 and the octahedron O sharing an edge, and the tetrahedron T 2 and the octahedron O containing a crystal structure sharing a corner, and a composition of Li 2y+3 PS 4 (0.1 ≤ y ≤ 0.175) the raw material composition containing Li 2 S, P 2 S 5, and elemental P; and either by (i) the sulfide solid electrolyte material comprising: a peak at a position of 2θ = 29.86° ± 1.00° in X-ray diffraction measurement using a CuKα ray, and a composition of Li 2y+3 PS 4 (0.1 ≤ y ≤ 0.175), or (ii) the sulfide solid electrolyte material comprising: an octahedron O comprising a Li element and a S element, a tetrahedron T 1 comprising a P element and a S element, and a tetrahedron T 2 comprising a P element and a S element; the tetrahedron T 1 and the octahedron O sharing an edge, and the tetrahedron T 2 and the octahedron O containing a crystal structure sharing a corner, and a composition of Li 2y+3 PS 4 (0.1 ≤ y ≤ 0.175) a peak at a position of 2θ = 29.86° ± 1.00° in X-ray diffraction measurement using a CuKα ray, and a composition of Li 2y+3 PS 4 (0.1 ≤ y ≤ 0.175), or (ii) the sulfide solid electrolyte material comprising: an octahedron O comprising a Li element and a S element, a tetrahedron T 1 comprising a P element and a S element, and a tetrahedron T 2 comprising a P element and a S element; the tetrahedron T 1 and the octahedron O sharing an edge, and the tetrahedron T 2 and the octahedron O containing a crystal structure sharing a corner, and a composition of Li 2y+3 PS 4 (0.1 ≤ y ≤ 0.175)