An embodiment of the present invention relates to an image processing device. There is provided an image processing device capable of suppressing a decrease in detection accuracy of a hall condition caused by an offset of the installation angle of a camera. According to an embodiment, there is provided an image processing device for performing image processing on an image including a waiting hall photographed by the camera in order to detect a situation where a user has routed to the waiting hall of a passenger car. The image processing device of the embodiment includes an acquisition unit, a calculation unit, and a correction unit. The acquisition unit acquires the image captured by the camera. The calculation unit calculates the difference between the position of the reference portion and the position as the reference when the position of the reference portion included in the acquired image does not coincide with the position determined as the reference for the reference portion. The correction unit corrects the setting value related to the image processing based on the calculated difference.