iming to understanding characteristics of heavy rains, we characterized heavy rain focusing on the rain intensity and temporal concentration. Hourly rainfalls exceeding 80mm are examined as heavy rain and there are 402 cases in the period from 2008 to 2017. We define a temporal concentration of precipitation (TCP), by a ratio of maximum hourly rainfall to the 24-hour rainfall amount. The scatter diagram of rain intensity and TCP is divided into four categories A-D. Among them, events in the category A are the most frequent. In the category A, rain intensity and TCP are relatively small. In the category B, rain intensity is relatively large while TCP is relatively small. In the category C, rain intensity is relatively small while TCP is relatively large. By examining special events, two cases belong to the category D (rain intensity and TCP are relatively large). Synoptic-scale disturbances of each event are studied. The heavy rainfall events of the category A are caused by various disturbances on the Pacific side and Kyushu District. Those of the category B are likely to occur by a stationary (Baiu) front in the region on the Pacific side and Kyushu District. Those of the category C occur by thunderstorm in the northern Kanto frequently.