To provide a screwdriver tool which can easily loosen a screw even if the screw is resistant to loosening due to rusting thereof, or a cruciform hole formed in a screw is crushed.

The screwdriver tool K1 is formed of an axial member 1 and a catching member 4. The axial member 1 has a cruciform support 3 on a distal end thereof and a grip portion 2 on the other end thereof. The catching member 4 has a claw 6 on a distal end thereof and a grip portion 5 on the other end thereof. The axial member 1 and the catching member 4 are connected together at a predetermined location. The screwdriver tool has a means for inserting the cruciform support 3 at the distal end of the axial member 1 into the cruciform hole 7 formed in the screw 9, catching an external edge 8 of the screw 9 by means of the claw 6 of the catching member 4, holding the grip portions, and rotating the grip portions leftward to loosen the screw.