A vibration structure of electrical toothbrush includes an eccentric rod. Two ends of the eccentric rod are respectively formed with a transmission section and a weight section. The transmission section is drivable by a driving force to rotate so as to drive the weight section to eccentrically vibrate. The weight section has an opening and a receiving space inward recessed from the opening. A cover member is correspondingly mated with the opening to cover the same. A weight block is disposed in the receiving space to partially or totally increase the weight of the weight section, whereby due to the increased weight, the weight section is unbalanced in weight to deflect from a central axis of the eccentric rod.
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