: The constant hard work of providing nursing care, including handling emergencies, often causes medical accidents in hospitals. This paper proposes a wearable auto-event-recording system of medical nursing in order to capture the events that cannot be overlooked in analyzing such accidents. Our main concern is that the system be user-friendly for nurses. We have prototyped wearable sensors and conducted experiments. Experimental results show that, without disturbing nurses’ work, our sensors can record data and reconstruct nursing histories, including the important events that are typically never recorded on written nursing logs.