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Critical thinking ability is an important thing that needs to be developed for the future of students. However, this has not been facilitated properly in the learning process of science. This study aims to develop inquiry-based science learning devices that are valid, practical, effective to improve students critical thinking skills. This R and D study adapted the 4D model (define, design, develop, disseminate) which was integrated with lesson study activities. The trial subjects in this study were students of class VIII SMPN in the city of Mataram. The development of learning devices uses lesson study activities (plan, do, see) that involve SMPN science teachers in the city of Mataram. . Product feasibility testing is carried out by experts using the validation instrument prepared by the researcher. Testing the practicality of the learning process using the implementation observation sheet, teacher response questionnaire, student response questionnaire and observation sheet of students critical thinking abilities. The results of data analysis show that learning devices are in the category of high validity, high practicality and effective for improving students critical thinking skills. In conclusion, the device of inquiry-based learning model developed through lesson study activities can be used to improve students critical thinking skills