The objective of this study is to detect the effect of using cooperative learning for teaching idioms to first grade students, learning French as a foreign language. The study was carried out on two groups -- experimental group and control group -- during the academic year of 2017-2018 in the lesson "Reading in French". The lesson was taught using traditional teaching methods with the control group, while using Jigsaw-II technique with the experimental group. According to the findings obtained from this research, the experimental group students, on whom the Jigsaw-II technique was applied, became more successful within the scope of learning idioms in French language.