To provide a drilling jig capable of coping with various sizes and curved surfaces with one drilling jig in drilling curved surfaces of a body to be drilled.

This drilling jig includes a jig body 20 for guiding a drill D and at least three movable legs 50 provided at the lower end of the jig body. Each of the movable legs is a shaft parallel to a rotating shaft of the drill, rotatably attached to the jig body independently and is structured to rotate around the shaft 52 between a storage position and a maximum development position.