A device for injecting a drug solution into the body (1) comprises a drug solution injection member (2), and a securing member (3) to which the drug solution injection member can be fitted. The drug solution injection member is provided with: an injection member body (6) having a drug solution inflow space (63) a discharge port (9) that communicates with the drug solution inflow space, and enables a catheter to be connected and a seal section (8) that allows the piercing of a drug solution injection needle. The securing member (3) is provided with: a drug solution injection member fitting and holding section (31) that holds the drug solution injection member (2) by inserting the drug solution injection member (2) therethrough and an extending section (32) that extends from the drug solution injection member fitting and holding section (31). The drug solution injection member and the fitting and holding section (31) of the securing member have forms that enable the orientation of the discharge port (9) to be selected within a prescribed range when fitted to the extending section of the securing member.Un dispositif pour injecter une solution médicamenteuse dans le corps (1) comprend un organe dinjection de solution médicamenteuse (2) et un organe de fixation (3) auquel peut être ajusté lorgane dinjection de solution médicamenteuse. Lorgane dinjection de solution médicamenteuse est muni : dun corps dorgane dinjection (6) doté dun espace dentrée de solution médicamenteuse (63) dun orifice de décharge (9) qui communique avec lespace dentrée de solution médicamenteuse et permet de raccorder un cathéter et dune partie détanchéité (8) qui permet le perçage dune aiguille dinjection de solution médicamenteuse. Lorgane de fixation (3) est pourvu : dune partie dajustement et de retenue de lorgane dinjection de solution médicamenteuse (31) qui maintient lorgane dinjection de solution médicamenteuse (2) grâce à linsertion de lorgane dinjection de solution médicamenteuse (2) e
