To provide a boring jig easily prepared without requiring difficult work while allowing accurate boring in a bored object surface.

This boring jig 100 for specifying a boring position T2 on the bored object surface T1 and guiding a boring tool equipped with a drill to bore perpendicularly in the boring position, is provided with a body plate 110 spaced from the bored object surface and fixed extending along the surface; boring position adjusting blocks 120 mounted to the body plate for every boring position on the bored object surface; and drill guides 130 mounted to the boring position adjusting blocks and having drill through holes 132.