Provided is a Cu-based sintered bearing comprising: 15-36 mass % of Ni; 3-13 mass % of Sn; 0.05-0.55 mass % of P; and 0.02-4 mass % of C in total, the balance consisting of Cu and inevitable impurities, wherein the content of C forming an alloy with a matrix within Cu—Ni-based main phase grains is 0.02-0.10 mass %.