An aberration-correcting optical relay for an optical system. The first interlayer insulating film includes a first tetraethyl orthosilicate film, a first hydrogen silsequioxane film, and a second tetraethyl orthosilicate film, which are sequentially laminated. The rotor includes n permanent magnet poles and n rotor magnetic materials that are alternately arranged in the circumferential direction. Limiting members, that limit the slide amount of the cage of the power roller bearing relative to the trunnion, are provided on the inclined portions.