To provide a guide-jig for a hand drill which can simply and precisely process a hole of a predetermined angle at a predetermined position of a workpiece with curvature.

A leading edge skin 11 and a leading edge rib 12 of an airplane which constitute workpiece W is positioned and temporary fixed at a workpiece supporting groove 28a of a workpiece supporting plate 28 of a workpiece supporting jig JW, and a guide protrusion 31a which is formed in a main part of the jig 31 of a hand drill's guide jig Jd is slide adjustably engaged at a guide groove 28c formed in a guide surface 28b of a workpiece supporting plate 28. In the state where a positioning surface 36c at the tip of a guide bush 36 which is swing adjustably supported through a spherical bearing 35 to the main part of the jig 31 is abutted to the surface of a leading edge skin 11, a drill 37 of the hand drill is inserted in a drill guide hole 36a of the guide bush 36 and rivet holes h1, h2 are processed in the leading edge skin 11 and the leading edge rib 12.