| 摘要 |
A screwing device (13) includes a screw shaft and a knob (36). The screw shaft is provided at a screw center axis (34) as the center thereof. The knob (36) includes a knob body (38) having the screw shaft projecting therefrom and an operating hole (44) provided on the knob body (38) about a hole center axis (43) as the center thereof in the direction intersecting the screw center axis (34). The operation hole (44) is arranged at a position deviated from the screw center axis (34). |
