Sound change has a long and troubled history in the development of linguistics. A group of linguistics so-called neogrammarians drew a lot of attention on sound change. Since then many linguists who were interested in linguistic change led a great deal of valuable and interesting research on sound change as well. Explanations of sound change have been sought. But they are not fully satisfactory, even though many important insights have been achieved on that. This paper is to discuss that sound change can be most appropriately accounted for on the basis of a syllable theory. According to the types of sound change I tried to find some examples which syllables actively interacted with sound change in some instances. It seems that the syllable has an important role in sound change. It seems appropriate first to make clear what are meant by the terms, "sound change" and "syllable." Sound change is a representation that contains phonological changes and phonetic changes. Syllables are built around a syllable nucleus, the most sonorous element in the syllable. Here I reviewed the arguments of several linguists about the existence of the syllable as a phonological unit.