1. A wide-angle image acquiring method, which photographs an object while using a first camera and a second camera, to acquire a first image and a second image, and which acquires a wide-angle image of the object while using the first image and the second image, comprising: a step of paralleling an Epipolar line of the first image with an Epipolar line of the second image, so that the Epipolar lines are made consistent with each other; a step of correcting distortions of the first image and the second image, each projected on a cylindrical imaging surface; a step of searching for a point which corresponds to an observing point on the first image, on the Epipolar line of the second image; and a step of reconstructing a three-dimensional figure of the object, after acquiring distances in a depth direction from the first and the second cameras to the object, based on a searched result of the step of searching, wherein in the step of reconstructing the three-dimensional figure of the object, when the distance between the first camera and the object is represented by R1 in a cylindrical coordinate system, said distance R1 is calculated by the formula shown below, 
 R 1= b×f/d′ in which formula, “b” represents the distance between the first camera and the second camera, “f” represents the focal length of the first camera and the second camera, and “d” represents the positional disagreement between the first image and the second image.