A solid electrolyte material of the present disclosure includes Li, M1, M2, and X. The M1 is at least one element selected from the group consisting of a group 2 element and a group 12 element. The M2 is at least three elements selected from the group consisting of a rare-earth element and a group 13 element. The X is at least one selected from the group consisting of F, Cl, Br, and I. A battery of the present disclosure includes a positive electrode, a negative electrode, and an electrolyte layer provided between the positive electrode and the negative electrode. At least one selected from the group consisting of the positive electrode, the negative electrode, and the electrolyte layer includes the solid electrolyte material of the present disclosure.