Nishida was CEO from 2005-9, and Sasaki was CEO from 2009 to 2013 when Tanska took over.
The chairman, Masashi Muromachi, is to take the CEO job pro tem.
An investigating panel said that profits were overstated by $1.2 billion over the seven years.
The panel also said that under the three CEOs a culture of intimidation stopped employees from protesting against unrealistic profit targets while execs were continually hassled by emails pushing for earnings increases.
