PURPOSE: To rapidly replace a bucket according to a work condition and as occasion demands and in turn to improve working efficiency by providing a handle and an upper guide constituted in a pantograph type.

CONSTITUTION: In an excavator, for example, a boom and a link 3 are interconnected through a pin. The upper and the lower parts of a the link 3 are supported by upper and lower guides 6 and 7, respectively, mounted on the back of a bucket 1. A gap (t) is provided between an upper guide 6 of the bucket 1 and the upper part of the link 3. By inserting key mounted on the two ends of a lever in the gap (t), vertical play of the bucket 1 based on the link 3 is constrained. Meanwhile, by pulling out a key from the gap (t), interconnection between the bucket 1 and the link 3 is disconnected. By mounting fixed plates on both sides of the bucket 1, lateral play of the bucket 1 based on the link 3 is constrained. This constitution removes the bucket through one action.