PROBLEM TO BE SOLVED: To provide a condition monitoring device for a railway vehicle capable of increasing versatility. SOLUTION: A railroad condition monitoring device 20 is attached to a bogie of a railroad vehicle 100, and provides state information regarding one or more of vibration, speed, acceleration, sound, reflected light, image, temperature, humidity and wheel diameter. Based on the acquisition unit 30 to be acquired and the state information attached to the bogie and acquired by the acquisition unit 30, a determination unit 44 that determines the state of the track 8 on which the bogie travels or the state of the bogie 10 and provides the determination result. A transmission unit 48 that is attached to the trolley and transmits a determination result to the outside of the trolley, and a power supply unit 70 that is attached to the trolley and supplies power to the acquisition unit 30 and the transmission unit 48. [Selection diagram] Fig. 3
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