There are so many patients who need a continuous vital sign monitoring. Monitoring a patient with a wearable device such as using electrode-based electrocardiography (ECG) signal recording device for a long time is very inconvenient. One possible solution is using contactless sensors such as radars to find vital signs of the subjects. In this paper, we demonstrate the use of frequency-modulated continuous wave (FMCW) radar operating at 77 GHz for monitoring a patient`s heart rate in a retirement environment. Several experiments were conducted to validate the reliability of the radar responses. Finally, the whole system is tested in a bedroom with the radar above a bed and a patient lying on it.