As a major part in the design processes of an airbag for use in the front passenger seat, airbag specifications defining the bag deployed shape, bag deployment direction, module location and bag storage methods were prepared based on various tests. The tests were conducted by taking into consideration the parameters specific t0 the passenger seat, i.e. wide range of age, physical size and weight of passengers, and seating conditions such as position, direction and posture. This paper analyzes the test results to find ways to obtain an effective protection capability of the airbag while reducing its impact on the passenger during deployment.