Quarkonium is a good playground for exotic hadrons because quark model predictions are robust thanks to the large masses of charm and bottom quarks. In e+e− colliders, quarkonia can be produced in various ways with good statistics, and indeed many so-called “XYZ” exotic candidates were found by experiments, such as Belle, at e+e− colliders. The Belle II experiment, which has just started its operation at the KEK laboratory in Japan, is a substantial upgrade of both the Belle detector and the KEKB e+e− accelerator, and aims to collect 50 times more data than Belle. Prospects for conventional and exotic quarkonia studies at Belle II are discussed.
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