A positive-electrode material 1000 according to the present disclosure includes a positive-electrode active material 110 and a cover layer 111 containing a first solid electrolyte and covering at least partially the surface of the positive-electrode active material 110. The positive-electrode active material 110 and the cover layer 111 constitute a covered active material 130; the positive-electrode active material 110 has a pore volume V α , the covered active material 130 has a pore volume V β , the positive-electrode active material 110 has a specific surface area S α , the covered active material 130 has a specific surface area S β , and at least one selected from the group consisting of 0.20 β /V α β /S α