A wearable device that continuously monitors the patient's breathing rate, with three inertial sensors (10, 11, 12), the first inertial sensor (10) located in the abdomen (13). The second inertial sensor (11) is located on the chest (14) and the third inertial reference sensor (12) is on the body part (15), which is not affected by respiratory movements. A device equipped with three inertial sensors arranged so as to be localized. Each inertial sensor (10, 11, 12) is equipped with an accelerometer, a magnetometer and a gyroscope. Each inertial sensor (10, 11, 12) comprises a microprocessor (21) connected to the accelerometer, magnetometer and gyroscope. The microprocessor (21) is connected to a transmitter (22) and processes a signal to generate a signal represented by a quaternion indicating the orientation of the three inertial sensors with respect to the earth's frame of reference. It is configured to send to the transmitter (22). The receiver (30) connected to the control center (31) has the abdominal quaternion of the first inertial sensor, the chest quaternion of the second inertial sensor, and the reference quaternion of the third inertial sensor. It is configured to receive the numbers and send those quaternions to the control center (31). The control center (31) is configured to process the received quaternion so that the reference quaternion serves as a reference for the abdominal quaternion and the chest quaternion. The control center (31) includes bandpass adaptive filters (55, 56) that filter signals represented by abdominal quaternions and chest quaternions to remove residual components associated with patient movement. .. The control center (31) is configured to calculate the respiratory rate from signals represented by the filtered abdominal quaternion and the filtered chest quaternion. [Selection diagram] Fig. 1患者の呼吸数を連続的にモニタリングする着用可能な装置であって、３個の慣性センサ（１０、１１、１２）で、１個目の慣性センサ（１０）は、腹部（１３）に配置され、２個目の慣性センサ（１１）は、胸部（１４）に配置され、３個目の、慣性基準センサ（１２）は、呼吸運動の影響を受けない身体の部分
