The injection device includes a detection unit including an electrode capable of detecting electrical characteristics of a living tissue, a first tracking mechanism that follows the movement of the living tissue, and a hollow portion that is punctured into the living tissue and partitioned inside A puncture part capable of administering the administration target to the biological tissue through the puncture part, the position of the puncture part can be specified based on the position of the electrode, and the puncture part follows the movement of the biological tissue. 2 follow-up mechanism, the second follow-up mechanism urges the needle member and the needle member toward the distal end side of the needle member, and the extension according to the movement of the needle member in the extending direction. And an urging member that can be expanded and contracted in the present direction.インジェクション装置は、生体組織の電気的特性を検出可能な電極と、生体組織の動きに追従する第１追従機構と、を備える検出部と、生体組織に穿刺して、内部に区画された中空部を通じて生体組織に被投与物を投与可能な穿刺部と、を備え、前記穿刺部の位置が、前記電極の位置に基づいて特定可能であり、前記穿刺部が、生体組織の動きに追従する第２追従機構を備え、前記第２追従機構が、針部材と、当該針部材を当該針部材の遠位端側に向かって付勢し、当該針部材の延在方向における移動に伴って当該延在方向に伸縮可能な付勢部材と、を備える。
