To provide a deformed screw effective to prevent the occurrence of galling and seizure and also contributing to the assurance of electrical continuity between fastened members by providing a film removal function.

In this deformed screw 10, a sectional shape projected in the direction perpendicular to the axial direction of threads 16 is formed in a hexagon shape by varying a height from an axis to the crest of the threads in the circumferential direction, the angle α1 of screw threads 16' on a head part side among the threads corresponding to the highest part of the threads 16 is set larger than the reference angle α0 of a general screw to press an edge part 2b at the crest part of a mating nut 2 against the side face of the screw threads 16' and adhere to the female screw of the nut 2 to mechanically peel off a film so as to make the deformed screw 10 partially metal-contact with the nut 2.