To provide a screw driver whose driver rod is less easily lost.

An accommodation hole 5 of a driver rod Ri is formed along an axis L of a grip 10, and openings 5a and 5b are formed in a forward end 10a and a rear end 10b. Other rods Ri including a second rod R2 are accommodated in the accommodation hole 5 in one row in the direction of the axis L at a rear end of a first rod R1 at the forward end. The first rod R1 is engaged with a grip 10 in the rotational direction S, and fixed so as not to be pushed in backwardly Y1 of the axis L during the tightening work. The first rod R1 can be drawn in the forward side direction Y2 of the axis L, and detached. When the drawn first rod R1 is pushed from the rear end opening 5b of the grip 10 and inserted in the accommodation hole 5, the second rod R2 is protruded from the forward end opening 5a.