A biological monitoring device includes a sensor included in a sensor device, performing a detection process of detecting a medical condition in a body of a patient, and performing a process of generating first detection data indicating a result of the detection process, a generation unit indicating contents related to the detection process, and performing a process of generating second detection data having a smaller data volume than the first detection data, on the basis of the first detection data, a communication unit realized by the sensor device, and performing a process of transmitting the second detection data to a terminal associated with the patient, and a control unit that is configured to cause the communication unit to perform the process of transmitting the second detection data to the terminal, when it is determined that the sensor device exists in the body of the patient.