TOKYO — Japanese prosecutors on Monday formally charged Carlos Ghosn, the former head of the Nissan-Renault auto alliance, with breach of trust, piling a new count of financial impropriety onto his existing charges in a move that adds pressure on him and ensures he remains jailed.

Mr. Ghosn, who continues to maintain he is innocent, has been in a detention center on the outskirts of Tokyo since April 4, when prosecutors swarmed into his apartment in an early morning raid. They seized evidence and dragged him off to jail — his fourth arrest in the case so far — before trying to take his wife in for questioning.

He was initially arrested in November on suspicion of hiding the true amount of his executive compensation and spent over 100 days in detention, racking up two additional arrests. Including Monday’s charge, prosecutors have indicted him on four charges of financial wrongdoing, including temporarily shifting his personal financial losses onto Nissan’s books.

He was released in early March after paying $9 million in bail and agreeing to strict limits on his activities that put him under virtual house arrest.