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Magnetic susceptibility measurements of Fe 3 O 4 have been performed under high pressure up to 15 GPa in the temperature range of 10-300K in order to study the mechanism of the Verwey transition. A diamond anvil cell (DAC) is used with fluid as a pressure transmitting medium. The pressure dependence of T V , at which the magnetic susceptibility changes suddenly, has been obtained. T V decreases and becomes sluggish above 7 GPa. The pressure dependence of T V is similar to that revealed by Todo's results obtained by electrical resistivity measurements using a cubic anvil device. In this study, the electrical resistivity measurements are also performed using the DAC up to 20 GPa.