PURPOSE: To reduce oscillation, noise, and driving torque to simplify the constitution and hold up a tester after the disintegration test, by oscillating vertically a roller and the tester with rotation of a cylindrical cam.

CONSTITUTION: During the disintegration test set by a controller 18, a cylindrical cam 13 is rotated forward by a motor 17, and a roller 10 is guided along a sine wave-shaped groove 19 on the cam 13 and is oscillated vertically while rolling in the direction of an arrow E, and the disintegration test is performed. A switching valve 21 is freely turned around a fulcrum 22, and the roller 10 passes the valve 21. After the test time, the motor 17 is reversed, and the roller 10 rolls relatively along the groove 19 in the direction of an arrow F and enters into a guide groove 20 through the upper face of the valve 21 and rolls in the direction of an arrow G and reaches an upper end horizontal part D. Then, a switch 23 is operated, and the motor 17 and the roller 10 are stopped, and the tester is kept hung up from a test liquid.