A magnetically shielded room (MSR) equipped with an automatic door is designed and developed to improve a convenience of door operation. The MSR is designed for biomagnetic measurements (e.g., magneto-encephalography), and it is required that such MSR has high shielding performance because biomagnetism is extremely smaller than environmental magnetic noises. In particular, we devise the laminar structure of shield plates and the automatic door structure to prevent leakage magnetic noise passed through a gap. Furthermore, the shielding performance is evaluated by an actual magnetoencephalography measurement, and we confirm the developed MSR has shielding performance which enables to measure biomagnetism.
