A deposition apparatus 50 forms a thin film 3 in a predetermined pattern on a substrate 10 for an organic EL display. A first correction plate 81 and a second correction plate 82 are placed between a shadow mask 60 and a deposition source 53 that emits deposition particles. Each of the correction plates 81, 82 has a plurality of blade plates 83 and a frame 84 that supports the plurality of blade plates 83. The blade plates 83 are placed so as to be tilted with respect to the shadow mask 60, and to extend parallel to each other with an opening 86 between adjoining ones of the blade plates 83 as viewed in a direction perpendicular the deposition mask 60.