To provide a measuring device capable of improving line quality between a slave machine and a master machine.

This measuring device 1b comprises a measuring part 11 measuring parameters of equipment 3b to be measured and acquiring measurement data D1b, and a control part 15 inputting the measurement data D1b and transmitting the measurement data D1b via a communication part 14. The control part 15 re-transmits the measurement data D1a until normal completion of receiving of the measurement data D1a by a measurement device 1a, counts the number of the re-transmissions, and stores the number of re-transmissions together with a time stamp Dta indicating the measurement time of the measurement data D1a with being corresponded to the time stamp Dta.