This study aims to examine the interaction among students during activities, the process until students express their idea, and the effect of clay on students through the collaborative learning in the Art and Handicraft. This research went through three phases: 1) developing and conducting lessons on clay focusing on "collaborative learning", 2) analyzing a questionnaire and a worksheet 3) scrutinizing children's conversations and activities recorded in each group. The result concerning "collaborative learning" revealed that the contents of the conversations, the activities and the learning differ from each other depending on a type of work. The finding about clay is that using clay in a lesson effectively enhanced children’s desires, and encouraged students to learn actively. The further lessons would be encouraged to use clay, and seek the effect and possibility of clay in the Art and Handicraft.