The purpose of this study was to investigate Korean children`s(1∼5th) conceptions about sound: the production of sound, the transmission of sound. Using interview, data were collected from 80 children, and analysed by category schemes. The major findings of this study were as follows: 1. Younger children thought that sound production was often attributed to the impact or to the properties of the object. 2. Sound transmission was not an idea which was expressed by many children. Some children considered sound to travel through the string on the string telephone, or through air, but what was meant by `air` was often unclear. Sometimes, they regarded sound as a different kind of matter. 3. A notable feature in children`s conceptions on sound was context-dependent.