This paper demonstrates the improvement in fabrication process of dry micro-needle electrodes by using sonication. In the medical field, wet electrodes are used to measure EEG which needs abrasion of stratum corneum and application of electrolyte paste as preparation. To avoid this pretreatment, we developed a candle-like microneedle electrode (CME). The electrodes avoid hair with the pillars and penetrate the stratum corneum with the micro-needles. In our previous research, we needed to take the air bubbles away from the point of the needles with our hands. However, since CME is usable only once in each experiment, we propose a new fabrication process for mass production. We use sonication for bubble removing and become it easier.