PROBLEM TO BE SOLVED: To provide past biological information data needed in an external device from an input device of a biological information monitor.SOLUTION: An input device of a biological information monitor is an input device composing the biological information monitor together with a separate display device and includes an input connector part, a communication connector part, a clock part in the input device, a storage part, and a measurement processing part. The measurement processing part measures biological information data from a patient through a biological information detection part connected to the input connector part, acquires date and time data when the measurement is made, from the clock part in the input device, associates the measured biological information data with the acquired date and time data, and causes the storage part to store them as measurement result data. Also, when outputting the measurement result data stored in the storage part to an external device through the communication connector part, the measurement processing part performs time difference reflection processing for reflecting the time difference between the external device and the input device in the measurement result data after being read from the storage device and before being output to the external device.
