A kind of needle tip protection structure of needle unit, needle unit include to have syringe needle, a needle stand and needle tip protection structure. Syringe needle have position what it is opposite to a syringe needle root and a needle tip, syringe needle root support what needle stand. It includes a pillar and a connecting piece that needle tip, which protects structure, and pillar, which slippingly covers, covers what needle tip, and connecting piece has a fixing end and a movable end, respectively in connection with what needle stand and pillar. What needle tip is covered by what pillar slip set, injection is avoided accidentally to pierce other people using the needle tip of Hou.一種針頭單元之針頭尖部保護結構，針頭單元包括有有針頭、一針座與一針頭尖部保護結構。針頭具有位於相對向的一針頭根部與一針頭尖部，針頭根部支承於針座。針頭尖部保護結構包含有一護管與一連結件，護管可滑移地套覆於針頭尖部，連結件具有一固定端與一活動端，其分別結合於針座與護管。由於護管可滑移套覆於針頭尖部，避免注射使用後的針頭尖部誤刺他人。
