The present invention relates to a radiation image taking apparatus including: a radiation image acquisition portion that acquires an electronic image based on a radiation transmitted through an object and outputs the electronic image; an image taking direction designation portion that designates a posture of the object with respect to the radiation image acquisition portion; a display portion that displays the posture of the object on at least one plane of the radiation image acquisition portion; and a coordinate conversion portion that performs coordinate conversion of the electronic image. The radiation image taking apparatus further includes a control portion that controls the displaying of the posture by the display portion and the coordinate conversion by the coordinate conversion portion based on the posture designated by the image taking direction designation portion.