To eliminate an obstacle sensor without remodeling a relay interlocking device by exhibiting an interlocking device monitoring function in a CTC station device in which software implementation progresses and the function is easily and inexpensively expanded.

This CTC station device is connected to the relay interlocking device 20 connected to a track circuit 12 and signals 11, 14, and includes a programmable logical section 42 for inputting on-rail train information and signal aspect information. A track circuit correctness discrimination program 62 for discriminating whether or not the operation of the track circuit 12 is normal based the on-rail train information and an interlocked sequence discrimination program 63 for discriminating whether or not the operation of the signals 11, 14 is normal based on the signal aspect information are installed into the logical section 42.