Human error occupies a large part of the medical accidents. Although pointing and calling is one of the countermeasures of Nurses' error, it is reported that the enforcement of pointing and calling is not thorough from the busyness of nurses' daily work. We propose the pointing and calling detection system for nurses. It requires the user to wear a small wireless sensor attached to one's upper arm and a wireless microphone attached to one's head, however it does not require for the user to equip any device to one's forearm, and does not need a camera. The logged history of the pointing and calling detection by this system contributes the conformation of the proper procedure of nursing service at the time of the coaching to a new nurse from senior nurse and the looking-back at the time of writing nursing record. The result of the preliminary pointing and calling detection experiment, which was conducted by twenty nurses in the simulated environment at Toyama prefectural Koshi Rehabilitation Hospital, Japan, suggests the feasibility of our detection method. Copyright 2013 ACM.