Shikoku-Kii intense rainfalls in 24-25 July 1982 are studied by using observational data and reanalysis data. A Baiu frontal depression developed over the Tsushima Strait in 23-24 July. The successive development of mesoscale precipitation systems in the warm-sector of the depression caused intense rainfalls over Kyushu. The depression weakened gradually after 12 UTC 24th, and intense rainfall area shifted from Kyushu to Shikoku-Kii area. Low-level moist southwesterly flow was intensified to the south of the weakened depression. Belt of convection in the southwesterly flow caused intense rainfalls over coastal zone of Shikoku-Kii area. The Kyushu intense rainfalls occurred in the developing stage of the Baiu frontal depression, while the Shikoku-Kii intense rainfalls occurred in the weakening stage of the depression.