In this study it is aimed to find out the effect of problem based learning on learning outcomes, problem solving skills and self efficacy belief. In this research experimental study has been used. In the extend of experimental study pretest-posttest control group experimental design has been used. Self-efficacy belief scale, problem-solving inventory and achievement test have been used to gather data. It can be seen from the achievement test results, problem based learning is more effective than the conventional teaching in achievement level of learner. There has been no significant difference between experimental and control group's self-efficacy posttest scores. According this result it can be said that problem based learning doesn't have an important effect on self-efficacy belief. Problem based learning has an impact on problem solving skills of learners. According to pretest and posttest problem solving inventory scores of experimental group, learners were less affected from problem based learning.