This paper examines the accent of native simplex nouns in North Gyeongsang Korean with a comparison to South Gyeongsang. It is assumed that both the North and South Gyeongsang dialects originate from the same source language, and in fact their accent systems are very similar. However, there are a few differences in their accent systems, which are due to different historical developments from Proto-Gyeongsang. Based on a detailed examination of the data, we demonstrate that small differences in the accentual systems as well as on-going tonal mergers in each dialect have led the two Korean dialects to have different association patterns between accent classes and segmental types/syllable weight: the expansion of the syllable weight effect in the initial syllable in North Gyeongsang vs. the generalization of aspirated/tense onset effect in South Gyeongsang. (Duksung Women’s University and Tokyo University of Foreign Studies)