The sputtering target 100 used in forming a positive electrode layer of a lithium-ion rechargeable battery is made of a sintered body including first particles 110 and second particles 120, the first particles 110 each containing lithium phosphorus oxide (e.g., Li3PO4) as an inorganic solid electrolyte, the second particles 120 each containing lithium transition metal oxide (e.g., LiNiO2) as a positive electrode active material.