This research is aimed to produce physics learning instrument with appropriate project based learning models and be able to train critical thinking skills in senior high school students. Learning instrument developed refers to the design of 4-D development (Thiagarajan, et al). The data were collected by observation, tests, interviews, questionnaires and documentation. The results showed valid learning instrument, N-gain of critical thinking skills scores were high, and responses were categorized as good. Based on the data obtained from the research results, it can be concluded that the learning instrument developed has satisfy the criteria of validity, practicality and effectiveness so that it is worth using to train critical thinking skills in students.