A connection tube of power tool is provided to be sleeved with a sleeve tube of power tool and is located in the sleeve tube. The connection tube of power tool is characterized in that the outer wall of the connection tube has at least one first portion and at least one second portion. The first portion is a curved surface and is located on the circumference of a first virtual circle, so that the first portion can be attached to the inner wall of the sleeve tube when the connection tube is sleeved with the sleeve tube. The second portion is an uneven structure and includes a plurality of first peak portions and first valley portions, which are arranged in parallel and disposed at intervals. Moreover, the top ends of the first peak portions do not exceed the circumference of the first virtual circle. By aforementioned design, the connection tube not only can achieve the purposes of increasing friction and having light weight, but also can have the effect of abrasion resistance. Thereby, the looseness of the connection tube can be avoided and the purpose of safety improvement can be achieved.一種動力工具之連接管件，用以供與一動力工具的一套管套接而位於該套管內，其特徵在於：該連接管件之外壁具有至少一第一部分以及至少一第二部分；該第一部分為弧面且位於一第一虛擬圓之圓周上，而使得該連接管件與該套管套接時，該第一部分可與該套管之內壁貼合；該第二部分為凸凹結構而包含有複數個平行且間隔排列之第一峰部與第一谷部，且該等第一峰部之頂端不超出該第一虛擬圓之圓周。透過上述之設計，該連接管件除可達到增加摩擦力以及輕量化的目的外，亦具有不易磨損的效果，而可避免該連接管件鬆脫進而達到提升安全性之目的。
