The purpose of the present invention is to provide a 6000-series aluminum alloy plate exhibiting bake hardening (BH) properties and molding properties after ageing at room temperature for a long period. One embodiment of the present invention suppresses comparatively small Mg-Si clusters that do not contribute to strength, increases as much as possible comparatively large Mg-Si clusters that do contribute to strength, causes sufficient exhibition of capture and release effects of Sn atomic vacancies, suppresses long-term room temperature ageing and increases hem workability, and improves BH properties, in a 6000-series aluminum alloy plate containing Sn and having a specific composition. In another embodiment of the present invention a 6000-series aluminum alloy plate having a specific composition contains Sn and, after ensuring an Mg+Si solid solution amount, the size distribution of atomic clusters measured by a three-dimensional atom probe field ion microscope is controlled in order to reduce yield ratio to less than 0.50, and both increased BH properties and reduced yield ratios are achieved.