1. A biometric authentication device, comprising: a memory configured to store a program; and a processor coupled to the memory and configured to: extract movement information representing bending and stretching of an imaging object from a plurality of images obtained from an imaging section, and determine whether the imaging object is of a biological object by comparing the movement information extracted with previously generated data characteristic of a biological object, and measure a movement of the imaging object using images having distance information representing distances of surface of the imaging object calculated from a position of and strengths of reflected light from the imaging object illuminated by an illuminating section, wherein biometric information of the imaging object is authenticated when the determining indicates that the imaging object is a biological object, wherein the images having the distance information are a plurality of images having distance information of the imaging object imaged from an open state to a closed state, or from the closed state to the open state, and wherein the movement information is information where a geometry model is fitted into an image, the distance information and plurality of images are normalized with respect to the movement of the imaging object, information of a height of the imaging object, or information of a size of the imaging object, and coefficients defining the geometry model are normalized with respect to a time of imaging the imaging object.