The
solid electrolyte material of the present disclosure contains Li, M, O, X, and A, where M is at least one selected from Ti, Zr, and Hf, X is at least one selected from F, Cl, Br, and I, A is at least one selected from P and B, the
molar ratio of Li to M is 1.0 or greater and 3.0 or less, the
molar ratio of O to X is 0.2 or greater and 0.7 or less, and the
molar ratio of A to M is 0.02 or greater and 0.80 or less.