Abstract: The invention concerns a device 5 for aiming an object 1 in an X-ray imaging apparatus 3 provided with a radiographic imaging detector 4, a radiation source 13, and transfer means for moving e.g. the radiation source into different points along a predetermined path P. Said device comprises at least one laser 6 emitting visible light, and e.g. at least two light guides having first ends and second ends, said first ends connected to said laser for receiving said visible light. Each of said second ends 8a, 8b, 8c provides a light beam, and these light beams 7a, 7b, 7c are directed towards said imaging detector with an angle of convergence K. The light beams are adjusted to intersect in a predetermined focus FL point, which is visible and indicates the proper position of the target 2 inside the object.