SCREWING DEVICE AND LUMINAIRE

摘要

A screwing device includes a screw shaft and a knob. The screw shaft is provided with a screw center axis as the center thereof. The knob includes a knob body having the screw shaft projecting therefrom and an operating hole provided on the knob body about a hole center axis as the center thereof, the hole center axis extending in a direction orthogonal to the screw center axis. The operation hole is arranged at a position deviated from the screw center axis so that the hole center axis does not intersect the screw center axis.