PURPOSE: An X-ray sensor is provided to efficiently control the operation of an X-ray photographing system by counting the number of operations through an operation counting unit. CONSTITUTION: An X-ray photographing device comprises an X-ray source and an X-ray sensor. The X-ray source generates an X-ray. The X-ray sensor detects the X-ray which passes through a target object. The X-ray sensor comprises a sensor case(240), an operation counting unit(230), and a connecting unit(250). A sensor(210) and a circuit part(220) are arranged inside the sensor case. The operation counting unit counts the operation count of the X-ray sensor or the X-ray photographing device by detecting the operation of the sensor or the circuit part. The connecting unit couples the sensor case in a location opposite to the X-ray source.본 발명은 엑스선 센서 및 이를 구비한 엑스선 촬영 시스템에 관한 것으로, 보다 자세하게는 그 내부에 엑스선 센서의 동작을 감지하여 엑스선 촬영 장치의 동작 횟수를 감지하는 동작 횟수 카운팅 수단을 구비하며, 상기 엑스선 촬영 장치에 탈부착이 가능하도록 하는 체결 부재를 구비한 엑스선 센서 및 이를 구비한 엑스선 촬영 시스템에 관한 것이다.
