PROBLEM TO BE SOLVED: To provide a highly versatile platform door diagnostic device, a platform door system, a platform door diagnostic method, and a platform door diagnostic program which can be used for diagnosing various types of platform doors. An acquisition unit 421 acquires identification data D1 that identifies a platform door and operation data D2 that represents a physical quantity related to an operation of opening and closing the platform door. The data conversion unit 422 identifies and identifies the data conversion necessary for changing the format of the operation data D2 acquired by the acquisition unit 421 to a predetermined common format by the identification data D1 acquired by the acquisition unit 421. The data conversion is performed on the operation data D2. The soundness diagnosis unit 423 diagnoses the soundness of the platform door using the operation data D2 that has been data-converted by the data conversion unit 422. The output unit 424 outputs the diagnosis result of the soundness diagnosis unit 423. [Selection diagram] Fig. 3
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