NIDEC CORPORATION announced in its published investigation report that it had confirmed 844 quality irregularities since 2012, including major quality cases. A shareholder derivative action was subsequently filed, and proceedings are moving forward to seek approximately ¥28.7 billion in damages from the founder and others.
On 4 September 2026, NIDEC CORPORATION announced that its investigation report had confirmed quality irregularities that had continued for many years. The total number of confirmed cases was 844, including 60 major quality cases and 784 general cases. Performance pressure and problems with the company's corporate culture were cited as causes, with examples including changes to materials, processes and designs without customer approval and falsification of inspection data. The president apologized in response, while also explaining that there would be no recall because there was no safety impact.
A shareholder derivative action was filed on the same day against founder Nagamori Shigenobu (永守重信) and Kobe Hiroshi (小部博志), seeking approximately ¥28.7 billion in damages. The action is described as seeking compensation from the individuals on behalf of the shareholders. The disclosure obligations and impact on performance are described as proceeding as separate matters.