A garnet-type Li-ion conductive oxide contains Li, La, Zr, and oxygen and contains at least one type of element among elements represented by M1, M2, M3, and M4. M1, M2, M3, and M4 are as follows: M1: One or more types of elements selected from the group consisting of Mg, Ca, Sr, Ba, and Zn; M2: One or more types of elements selected from the group consisting of Al, Ga, Co, Fe, and Y; M3: One or more types of elements selected from the group consisting of Sn and Ge; and M4: One or more types of elements selected from the group consisting of Ta and Nb.
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