Velocity measurement of electric field driven microbubbles is attempted by PTV. Cationic surfactant are dissolved to add positive electric charge to the microbubbles. These electrified microbubbles are placed in artificially applied electric field. Direction of the microbubble movement is limited only in horizontal direction to avoid influence of gravity. The microbubbles are moved toward the negative electrode by Coulomb force in the electric field. Diameter and velocity of each microbubble are measured by digital image processing. It is found that the velocity of microbubble is increased with increase of the electric field strength (voltage between positive and negative electrodes). It is also revealed that the velocity increases with increase of diameter of the microbubble. This trend is remarkably observed in large electric field strength condition. From the above, it is confirmed that the velocity of microbubble is able to be modified by electric field strength and diameter of the microbubble.