PURPOSE: To obtain a light-weight strong bucket having an improved excavating property and a long life by using a bucket lip integrally made up of a bucket lip plate, a tooth adaptor, and a bucket wing.

CONSTITUTION: Tooth adaptors 2 are set at intervals on the front edge of a bucket lip plate 1 in such a way that tooth adaptors 2a and 2b on the outermost sides are leveled with the side end face of the bucket lip plate 1. A side tooth adaptor 6 is formed by being turned outwards at a given angle to the advancing direction of the lip and fixed to a bucket wing 3 by bolt and nut. The nose 2' of the tooth adaptor 2 and the nose 6' of the side tooth adaptor 6 are each attached detachably with a tooth blade edge 4.