A novel synchronizer ring for use in a speed variator that is made of a Cu base alloy and which exhibits good initial accommodation by mating surfaces while ensuring high wear resistance is disclosed. The ring is made of a Cu base alloy containing 20-40% Zn (all percents being on a weight basis), 2-8% Al, and at least two components (intermetallic compound forming components) selected from among the following five elements, i.e., 0.1-3% of at least one of Ti, Zr and Cr, 0.1-3% Sn, 0.1-6% of at least one of Fe, Ni and Co, 0.1-5% Mn and 0.2-2% Si, and optionally at least one additional component that differs from said selected two components and which is selected from among 0-5% Mn, 0-3% Sn and 0-3% of at least one of Ti, Zr and Cr, and the balance being Cu and incidental impurities. The ring also has either an oxide film layer of aluminum oxide base with an average thickness of 0.1-10 .mu.m or a work-hardened layer with an average thickness of 5-300 .mu.m formed on the surface of the ring where it is to contact a mating member.