PURPOSE: To decrease the moving speed of a vessel contg. a sample toward the other end part and to prevent the rupture of the vessel by providing explosive layers for deceleration which are exploded by the bombardment of a flying member and impulsive wave attenuating plates in both end parts of said vessel.

CONSTITUTION: A sample 1 is contained in a vessel 2, and plugs 3, 4 are provided in both end parts thereof. Preventing means for rupture of the vessel wherein explosive layers 21, 22 for deceleration are sandwiched with impulsive wave attenuating plates 23, 24 and 25, 26 are provided respectively on the other sides thereof. A flying member 5 and a main explosive layer 9 are provided on the outside circumference of the vessel 2 via a space 6, and a plane detonation wave generating means 30 is provided in the upper part. A plastic plate 27 is provided in the lower part. For example, penthrite or the like which is subjected to a molding treatment is used for the layers 21, 22 and, for example, metharcylics, etc. are used for the plates 23W26. The sample is subjected to an impact compression treatment by actuating a detonator 11, whereby the high pressure impact treatment of the sample is accomplished uniformly.