Traditionally IEEJ concentrates main force on research and investigation. A thousand of engineers working on the front line take part in about 200 Investigating research Committees belonging to 52 Technical Committees and annually hundreds of valuable reports are published.

• Fundamentals and Materials（code: A）
• Power and Energy（code: B）
• Electronics, Information and Systems（code: C）
• Industry Applications（code: D）
• Sensors and Micromachines（code: E）