To decrease required temporary construction materials in a safety device of an elevator for construction work for limiting the rising and lowering range of a car frame when an elevator is installed by driving the car frame.

In a safety device, a limit switch 12 is attached to a car frame 2 when the hoistway equipment is installed by using the car frame 2 for the final construction, and second cams 7a, 7b are provided on a guide rail 1 for guiding the car frame 2 so as to be positioned above and below the car frame 2 and so as to be brought in contact with the limit switch 12. A bracket provided with a horizontal piece provided with a U-shaped gripping body to be gripped and fixed is provided on a first cam 14 for the final construction provided on the car frame 2, and the limit switch 12 for the final construction is fastened to the horizontal piece of the bracket.