PROBLEM TO BE SOLVED: To stop whirling of a nut while preventing deterioration of workability.;SOLUTION: A whirl-stop structure comprises: a spindle 2 rotating in a direction B around an axis; a nut 5 screwed into the spindle 2, and formed with a plurality of bolt holes 51; a lock plate 6 formed with a locking claw 62, wherein the locking claw is locked to a key groove 23 formed in the spindle 2, and also formed with a plurality of open holes 63; and n pieces of bolts 7 screwed into the bolt hole 51 through the open hole 63. When n pieces of bolt holes 51 is defined as a bolt hole set 51A, the nut 5 is formed with a plurality of bolt hole sets 51A.;SELECTED DRAWING: Figure 2;COPYRIGHT: (C)2019,JPO&INPIT
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