PROBLEM TO BE SOLVED: To efficiently execute, when displaying an X-tomographic image Gx, a Y-tomographic image Gy and a Z-tomographic image Gz based on three-dimensional volume data 43 obtained by X-ray CT, the display in a designated display condition.SOLUTION: The X-ray image display device 2 includes: a display unit 5 configured to display an image based on the three-dimensional volume data 43 of an area designated by an enlargement area designation unit 33 in a designated area CT image display screen 50A a cross-sectional position control unit 31 configured to permit a designating operation of slice position, rotating angle or the like when displaying a designated area CT image and a storage unit 23 storing a slice position, rotating angle or the like in the designated area CT image in association with the designated area CT image.
