This medicine injection catheter comprises: a catheter body in which a medicine supply lumen is formed； a tubular body that is connected to a tip end of the catheter body, and that has a lumen which communicates with the medicine supply lumen； an injection needle that is connected to a tip end of the tubular body； a cylindrical cover member that has an internal space for housing the tubular body, and that is arranged at a tip end section of the catheter body so as to be advanceable/retractable along the axial direction of the catheter body between a first position at which the tip end of the injection needle is housed in the internal space and a second position at which the tip end of the injection needle projects frontward from the internal space； an open/close mechanism that includes an operating member rotatable in the circumferential direction of the catheter body within the internal space of the cover member, and that can open/close the lumen of the tubular body in accordance with the position of rotation of the operating member； a motion conversion mechanism that converts the advancement/retraction movement of the cover member into rotation movement of the operating member, the motion conversion mechanism causing the open/close mechanism to close the lumen of the tubular body when the cover member is located at the first position, and causing the open/close mechanism to open the lumen of the tubular body when the cover member is located at the second position； and an elastic member that elastically presses the cover member with respect to the front of the catheter body toward the first position.La présente invention concerne un cathéter d'injection de médicament comprenant : un corps de cathéter dans lequel une lumière d'alimentation en médicament est formée ； un corps tubulaire qui est raccordé à une extrémité de pointe du corps de cathéter, et qui a une lumière qui communique avec la lumière d'alimentation en médicament ； une aiguille d'injection qui est rac
