There is disclosed a driving device for a recording head such as a thermal head (10) or an ink jet head driven in plural blocks, capable of avoiding formation of division lines, or low-density streaks, in the recorded image at the boundaries of the driving blocks of the head (10). In this driving device, the time difference between the start of pulse application to a heat generating element of the recording head (10) and that to an adjacent element is maintained not exceeding the maximum pulse duration to the heat generating element. Also a group of plural heat generating elements positioned at the boundary of two divided blocks is activated simultaneously with each of the two divided blocks.