[en] As one of the development programs of the cask for the post-irradiation examination of the FBR fuels, the drop tests were carried out using the half scale model of the cask. The objectives of the tests are to demonstrate that the cask body has ability to withstand the drop test conditions imposed for type BM-packages and maintain the tightness integrity and then to confirm the validity of the evaluation method for deceleration and deformation of shock absorbers used in safety analyses. The another purpose of the tests in to obtain the initial conditions of the thermal test following drop tests, which is another one of the development programs. We carried out successively the following four tests by using the half scale model. 1) 9 m horizontal drop test, 2) 9 m vertical drop test turning lid downward, 3) 1 m drop punch test onto lid, 4) 1 m drop punch test onto body in horizontal position. This paper describes the test procedures, test results and their comparisons with the analysis results. (J.P.N.)