Hong, Eun-jin. 2004. An Analysis of Vocabulary Errors by Japanese Learners of the Korean Language. The Sociolinguistic Journal of Korea, 12(1). This paper examines vocabulary errors, especially focusing on replacement errors in writing, of Japanese who learn the Korean language. Through the analysis of these vocabulary errors in writing, it was found that the important causes of the errors are native language influence, target language influence, and educational curricula, etc,. This study attempts to explain the errors through a contrastive analysis of Korean and Japanese. The results of the analysis are presented with the error list, the error correction list, and the study list for objective research. The findings of this research can be summarized as follows: First, errors with nouns that aren’t used in the target language are caused by the transfer of the native language. Second, errors with adverbs occurred in relation to sentence meaning rather than word meaning itself. Third, errors with number adjectives appeared in the combinations of ‘native Korean numeral + Chinese-origin noun’, or ‘Chineseorigin numeral + Chinese-origin noun’. The teaching of combination rules about these sequences will help Japanese learners of Korean to decrease these errors. Fourth, many errors with verbs and adjectives were found to come from meaning similarity that exists between the native and target languages. Fifth, errors with collocations were due to the transfer of Japanese to the target language and also to similarities in meaning.