Compared to a conventional needle removal device, the procedure for removing the injection needle can be simplified and used easily, the device cost can be reduced, and the discarded medical waste is made possible. Provided is a needle removal device that can be reduced in volume. SOLUTION: A cylindrical outer cylinder that can be attached to a needle housing case, a spiral trajectory formed in a spiral shape on the inner peripheral surface of the outer cylinder, and a spiral screw turning in the outer cylinder along the spiral trajectory A syringe holding cylinder, a syringe needle tightening ring that is provided at a lower end portion of the syringe holding cylinder and holds the syringe needle base portion of the syringe inserted in the syringe holding cylinder, and a syringe needle tightening ring. A locking mechanism for stopping the syringe holding cylinder in a state exposed from the lower side of the outer cylinder, and the needle tightening ring pivots to detach the injection needle base from the syringe body and lowers the syringe holding cylinder. It was decided that the needle base portion was expanded in the shape of a split by the turning force accompanying the operation, and the syringe needle base was discarded together with the syringe needle into the syringe needle storage case. [Selection] Figure 3【課題】従来の針除去装置に比して、注射針の離脱操作手順を簡略化して手軽に使用することができ、装置コストを低廉化することができ、投棄される医療廃棄物を可及的に減容化することができる注射針脱去装置を提供する。【解決手段】注射針収容ケースに取着可能な筒状の外筒体と、外筒体の内周面に螺旋状に形成した螺旋軌道と、螺旋軌道に沿って外筒体内を旋回螺進する注射器保持筒体と、注射器保持筒体の下端部に設けられ、注射器保持筒体に挿入された注射器の注射針基部を挟持しつつ保持する注射針緊締用リングと、注射針緊締用リングが外筒体の下方から露出した状態で注射器保持筒体を停止させる係止機構と、を備え、注射針緊締用リングは旋回により注射器本体から注射針基部を離脱させると共に、注射器保持筒体の下降動作に伴う旋回力により先割状に拡開して注射針基部を注射針ごと注射針収容ケース内へ投棄すべく構成してなることとした。【選択図】図３
