1. An X-ray imaging device comprising: an X-ray generation unit which emits X-rays to a sample; an X-ray detection unit which detects the amount of X-rays passing through the sample; an imaging control unit which two or more times rotate the X-ray generation unit and the X-ray detection unit around the sample as a rotation center and imaging the sample at a plurality of rotation angles different from each other during the rotation; and an image calculation unit which acquires a three-dimensional image of the sample by performing a calculation process including at least a reconstruction to the plurality of two-dimensional images which are acquired by performing imaging during the rotations of the X-ray generation unit and the X-ray detection unit, the image calculation unit including: a first reconstruction unit which acquires a tissue image of the sample by performing a reconstruction to the two-dimensional images acquired from the sample without a contrast, a second reconstruction unit which acquires a tissue/blood vessel image including tissues and blood vessels of the sample by performing a reconstruction to the two- dimensional images acquired from the sample with a contrast, and an inter-image calculation unit which acquires a three-dimensional soft tissue image, a three-dimensional soft tissue/blood vessel image, and a three-dimensional blood vessel image, by performing an inter-calculation between the tissue image and the tissue/blood vessel image, the inter-image calculation unit including: a first calculation unit which acquires the blood vessel image from the difference between the tissue image and the tissue/blood vessel image, a second calculation unit which acquires a tissue image from the difference between the blood vessel image acquired by the first calculation unit and the tissue/blood vessel image acquired by the second reconstruction unit, a third calculation unit which acquires the soft tissue image by adding the tissue image acquired by the second calculation unit and the tissue image acquired by the first reconstruction unit, and a fourth calculation unit which acquires the soft tissue/blood vessel image by adding the blood vessel image acquired by the first calculation unit and the soft tissue image acquired by the third calculation unit.