To provide the screw which can get the condition being hard to separate the screw driver part of a screw driver from the screw driver engaging recessed part of the screw top part and control the production cost comparatively at low and the screw driver for turning and operating this screw in the screw driving operation.

The screw 6 (7) includes the recessed part 611 (711) which engages the screw driver part 51a (51b) of the screw driver 5 to the top part 61 (71), wherein the hole 612 (712) for fitting engagement of a latch projection 511 (512), which is projected from the screw driver part of this screw driver, is formed at the recessed bottom part. And the screw driver 5 of the screw 6 (7) is obtained.