Iwanami Productions Inc., a major documentary film producer, on Thursday sought court protection from creditors under the bankruptcy law.

The company, with liabilities totaling 1.2 billion yen, filed the application with the Tokyo District Court, company sources said. Management faced difficulties a few years ago, and reconstruction efforts, including sales of its office building, were unsuccessful, the sources said.

Iwanami Productions, a company under prestigious Iwanami Shoten Publishers, was established in 1950 to produce science films. Several well-known directors such as Susumu Hani, Shinsuke Ogawa and Kazuo Kuroki cut their teeth at Iwanami.