To provide a screw which can prevent the dropout at the time of attaching from the lower position, shorten the required time to find out the screw attached to the recess place and also exchange a nameplate or a character.

The dropout preventing screw is characterized to attach the hold part 4 capable of setting the tip of a driver in the head 3 of a thread part where the male screw 2 is formed. Moreover, it is characterized to form the screw hole 5 for fitting for screwing a small screw in the side part of the hold part 4 of the dropout preventing screw.