PURPOSE: To enlarge a work range of a crashing device which crushes an article to be demolished with a crashing claw installed to a fixing arm and a turnable arm.

CONSTITUTION: A frame 16 is turnably mounted on a bracket 11 which is rockably installed to the tip of a construction machine. The middle part of a fixing arm 2 having a crush claw 24 at the tip is turnably mounted on a pair of side plates 16a of the frame 16. A movable arm 28, which is opened and closed to the crashing claw 24 of the fixing arm 22 is mounted on the fixing arm 22. A fixino device is installed, which fixes the fixing arm 22 at both positions at which the fixino arm 22 is rocked on both sides by a specified angle, thereby enlarging the work range by rocking the fixing arm 22.