The present invention relates to a spindle locking device, a power tool applying the same, and an actuator for a vehicle. In the present invention, the lock ring 20 is installed inside the housing and has an installation space 25 therein, and at least a part is located in the installation space 25 and has a cam driver 15 on one side and a driving device is connected to the other side. The spindle 10 is accommodated in the installation space 25 and is connected to the motor to rotate while the cam groove 35 engaged with the cam driver 15 to transmit the rotational force of the motor to the spindle 10 is the center Including a carrier (30) and a locking assembly (50). The locking assembly 50 is housed in the installation space 25 to make the spindle 10 locked so that the spindle 10 does not rotate by an external force acting on the driving device, but a plurality of locking means 80 revolving inside The silver is installed in the installation space 25 so as to surround the cam driver 15 while being accommodated in the retainer 70.
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