To provide a bucket having an excavation tooth for facilitating the replacement and storage-management of the tooth, by effectively utilizing a material of the tooth.

This tooth of the bucket is detachably installed on the under surface part tip of the excavation bucket. The tooth is characterized in that a sharp part is arranged in both a tip part and a rear part of the tooth; the tip part and the rear end part are inversely installed to be usable; and a positioning boss is arranged in the center between the tip part and the rear end part.