As a part of a test series on engineering properties of Shirasu for construction materials, shaking table tests were carried out to investigate liquefaction potential of saturated Shirasu. Saturated Shirasu layers were prepared in a steel box fixed on a shaking table and subjected to harmonic motions of about 3.2Hz. Acceleration amplitudes were increased stepwise from 50 to 500gals. During the tests the saturated Shirasu layers liquefied and behaved like liquid. The tests results were compared with the results from similar tests of the sand which liquefied during the Niigata earthquake in 1964 and it was concluded that Shirasu has possibility to liquefy in earthquakes.