PROBLEM TO BE SOLVED: To easily assemble an X-ray diagnostic apparatus.SOLUTION: An assembly assisting device is used for assembly of an X-ray diagnostic device 100 having a bed part 210 on which a subject is placed, an X-ray tube holding part 220 which holds an X-ray tube, an elevating part 230 to which the bed part 210 and the X-ray tube holding part 220 are fitted, and a support part 240 which supports the elevating part 230 to freely rise and fall. The assembly assisting device includes an arm 11, a moving body 13, a lifting instrument 15 and a connection mechanism 17. The arm 11 is fitted to the support part 240. The moving body 13, is movably set along the arm 11. The lifting instrument 15 is set to the moving body 13, and the bed part 210 and the X-ray tube holding part 220 can be fitted to the lifting instrument. The connection mechanism 17 connects the elevating part 230 and the lifting instrument 15 to each other for elevating the lifting instrument 15 to the moving body 13 interlocking with elevation of the elevating part 230 to the support part 240.SELECTED DRAWING: Figure 8
