| 摘要 |
There are provided a cam plate ( 5 ) that rotates in an unlocking direction and a locking direction, and a locking shaft ( 8 ) that moves between a locking position where rotation of a steering shaft is prevented and an unlocking position where the rotation of the steering shaft is permitted by rotation of the cam plate ( 5 ). The cam plate ( 5 ) is provided with a steering lock preventing unit ( 20 ) through a spring ( 22 ). The steering lock preventing unit ( 20 ) holds the locking shaft ( 8 ) in the unlocking position. A ball ( 23 ) moves on a moving surface ( 24 ) of a motor unit ( 4 ) opposed to the cam plate ( 5 ) by rotation of the cam plate ( 5 ). A projecting wall ( 25 ) is provided on the moving surface ( 24 ) at a position before the unlocking position in a range where the ball ( 23 ) moves from the locking position to the unlocking position.
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