To perform an installation work at the upper position of the guide rail for a plunger from the upper part of a car without removing the suspension device.

A suspension device in which a suspension work is performed by a weight lifting means while a space between paired guide rails 18a and 18b is being connected together, enables a pulley to be mounted onto a plunger to pass through a central part 21c between holding members 21a and 21b. Both end portions 21d of opposite holding members 21a and 21b are set narrow in such a way as to be positioned in the inner side of each piano wire 18a and 18b.