An X-ray imaging method using an X-ray imaging device that includes a scintillator, one surface of which is an X-ray incident surface and which generates scintillating light in accordance with incident X-rays to convert an X-ray image to an optical image, and an imaging element, which is disposed so as to face the other surface of the scintillator and detects the optical image generated by the scintillator to acquire an X-ray observed image corresponding to the X-ray image made incident on the scintillator, and comprising: a first image acquisition step of acquiring, by means of the X-ray imaging device, a first X-ray observed image that contains a signal image component, corresponding to the X-ray image converted to the optical image by the scintillator, and a first noise image component, due to X-rays made directly incident on the imaging element; characterized in that the method further comprises a second image acquisition step of acquiring, by means of the X-ray imaging device and at a different time from the first X-ray observed image, a second X-ray observed image that contains a signal image component, corresponding to the X-ray image converted to the optical image by the scintillator, and a second noise image component differing from the first noise image component, due to X-rays made directly incident on the imaging element; a subtraction processing step of performing a subtraction process between the first X-ray observed image and the second X-ray observed image to generate a noise image into which the noise image components are extracted and the signal image components are cancelled out; a threshold value processing step of performing a threshold value process on the noise image to extract the first noise image component among the noise image components; and a noise removal step of subtracting the first noise image component, extracted in the threshold value processing step, from the first X-ray observed image that contains the first noise image component to generate a noise-removed image, with which the first noise image component is removed, wherein in the subtraction processing step, the second X-ray observed image is subtracted from the first X-ray observed image so that, in the generated noise image, the first noise image component has a positive intensity value and the second noise image component has a negative intensity value, and in the threshold value processing step, a positive intensity value is set as a threshold value for selectively extracting the first noise image component and eliminating the second noise image component. a first image acquisition step of acquiring, by means of the X-ray imaging device, a first X-ray observed image that contains a signal image component, corresponding to the X-ray image converted to the optical image by the scintillator, and a first noise image component, due to X-rays made directly incident on the imaging element; a second image acquisition step of acquiring, by means of the X-ray imaging device and at a different time from the first X-ray observed image, a second X-ray observed image that contains a signal image component, corresponding to the X-ray image converted to the optical image by the scintillator, and a second noise image component differing from the first noise image component, due to X-rays made directly incident on the imaging element; a subtraction processing step of performing a subtraction process between the first X-ray observed image and the second X-ray observed image to generate a noise image into which the noise image components are extracted and the signal image components are cancelled out; a threshold value processing step of performing a threshold value process on the noise image to extract the first noise image component among the noise image components; and a noise removal step of subtracting the first noise image component, extracted in the threshold value processing step, from the first X-ray observed image that contains the first noise image component to generate a noise-removed image, with which the first noise image component is removed, wherein in the subtraction processing step, the second X-ray observed image is subtracted from the first X-ray observed image so that, in the generated noise image, the first noise image component has a positive intensity value and the second noise image component has a negative intensity value, and in the threshold value processing step, a positive intensity value is set as a threshold value for selectively extracting the first noise image component and eliminating the second noise image component.