TOKYO, May 17 (Reuters) - Longer-dated Japanese government bond yields ticked higher on Tuesday as optimism for an end to coronavirus lockdowns in China buoyed market sentiment.

The 10-year JGB yield rose 0.5 basis point to 0.245%, while the 20-year yield advanced 1.5 basis points to 0.765% and the 30-year climbed the same amount to 1.015%.

That came as Japan's Nikkei stock average gained with Chinese equities and other regional peers after Shanghai achieved the long-awaited milestone of three straight days with no new COVID-19 cases outside quarantine zones, which could lead to the beginning of the lifting of restrictions.

Japanese bond futures and shorter-dated JGBs were more subdued, with benchmark 10-year JGB futures barely budging at 149.48.

The five-year yield was flat at 0.010%, while the two-year note was untraded, last yielding -0.060%. (Reporting by Kevin Buckland; Editing by Christopher Cushing)