| 摘要 |
PROBLEM TO BE SOLVED: To provide a screw structural body which is capable of improving the durability of inserted parts and suppressing generation of the racing noise, and a mirror actuator of an automobile using it. SOLUTION: Since the depth of a screw groove 17 in an incomplete screw part S2 is similar to a complete screw part S1, a claw part of an inserted parts is not excessively deflected inward. Even when the screw groove 17 of the incomplete screw part S2 is thus deep, the claw part of the inserted parts can be easily returned over a thread 16a since the adjacent thread 16a is low. Thus, even when the inserted parts is run idle in the incomplete screw part S2, the claw part is not excessively deflected inward, nor the claw part is deformed to degrade the durability, nor the racing noise is increased.
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