1. An image reading method for producing image data by irradiating an image carrier including two-dimensionally distributed spots of a labeling substance with a stimulating ray to excite the labeling substance and photoelectrically detecting light released from the labeling substance, the image reading method further comprising a stimulation and detection step of irradiating the image carrier with a line beam of the stimulating ray to excite the labeling substance and photoelectrically detecting light released from the labeling substance after the completion of irradiation with the stimulating ray.