The proportion of dozing in all ship accidents is about 7% (2005) . The purpose of this study was to investigate ship accidents caused by dozing watch − keepers that actually resulted 三 n marine accidents , Marine accidents that had been described to the judgment record ofMarine Accidents InquiIy Agency between 1994 and 2003 were used f () r analysis . The authors investigated the relationship between tbe situations at the doze shipwreck and analyzed data , which included a 30 − item categor 量 zation procedure . The analysis of fishing vessels revealed there was a notable relationship between the situation of ' ' Generated in coast in Hokkaido " and the in 伽 e皿ce of " Work tiredness " . The analysis of cargo ships revealed there was a notab 】 e relationship between the situation of " Watch by one person " and the influence of ' 」 Night shift " . These results suggest that consideration of ship type may be necessa 「 y developing cou 皿ter measures , KeywordS:Accident analysis , Mariti 〃 昭 Cαsua めe l) oze , Sleep キ ー ワ ー F