Screw member, screw member fastening method, and screw member fastening device

The problem to be solved by the present invention is to provide a screw member that can be easily fastened without causing poor fastening. In order to solve the problem, a screw member (1) is provided with: a cylindrical leg part (2) having a thread (5) formed on the outer peripheral surface thereof; a head part 3 provided at one end of the leg part 2 in the axial direction; and a guide protrusion (4) provided at the other end of the leg (2) in the axial direction and protruding toward the other end side in the axial direction. The leading end portion of the guide protrusion (4) has a long side direction and a short side direction perpendicular to the long side direction. 本发明所要解决的问题在于，提供一种可以容易地进行紧固而不会产生紧固不良的螺钉部件。为了解决上述问题，螺钉部件1包括：腿部2，为圆柱状，在外周面上形成螺纹5；头部3，设置在腿部2的轴向上的一端部；及，引导凸部4，设置在腿部2的轴向上的另一端部，向前述轴向上的另一端侧突出。引导凸部4的前端部具有长边方向及与前述长边方向垂直的短边方向。