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The purpose of this study is a lesson study joint learning forum for mutual learning from experience in order to stimulate critical thinking of students in the Cell Biology course in the Biology Education Study Program FKIP Muhammadiyah University of Bengkulu. This research is an action research with a qualitative-descriptive approach carried out for 4 cycles. The stages of the lesson study are learning planning (plan), Implementation of learning (Do) and Reflection (See). The results showed that students critical thinking skills in learning Biology Cells through the implementation of lesson studies gained an average score of 85% in either category. The development of the ability to manage classes that have been done through the implementation of lesson studies to stimulate students critical thinking has increased.