PROBLEM TO BE SOLVED: To provide a pad for correcting local-field ununiformity capable of further correcting the ununiformity of a local field compared with that of a conventional field distortion removal cushion and improving clearness of images.SOLUTION: A pad 1 for correcting local-field ununiformity includes, inside a bag body 11 consisting of a gas barrier material, a water-soluble solution 12 obtained by dissolving a manganese material, and granular bodies 13 for uniformly dispersing the water-soluble solution 12 inside the bag body 11. The concentration of divalent manganese ion in the manganese material is preferably 0.83-1.66 g/L, more preferably 0.97-1.39 g/L, and further more preferably 1.11 g/L.SELECTED DRAWING: Figure 11
