We have developed a patient monitoring system in a hospital which can remotely and continuously monitor the state of a patient in a room, such as the electrocardiogram (ECG), body surface temperature and three-dimensional (3D) acceleration, with a wireless vital sensor. In this paper, we show the detail on the elements of the system, namely, the capability of the wireless vital sensor, diversity reception technique and triage engine which can automatically send an urgent message from the room to a nurse station as well as a medical doctor when it detects the occurrence of an urgent event on the patient.