To reduce time for measuring an error rate by minimizing an overhead.

An external processor 10 transmits a package command, where commands for testing to be transmitted have been packaged into one package command, by one telegram. An error rate measuring device 20 includes: a main control section 21 for outputting the package command transmitted from the external processor 10 in the received state and transmitting measurement result data of a device 30 to be tested to the external processor 10 by one telegram; a sub-control section 22 for analyzing the package command from the main control section 21, and performing command setting based on a command content of the command for testing according to a preset setting procedure; and an error rate measurement section 23 for measuring the error rate of the device 30 to be tested according to the command content set by the sub-control section 22.

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