The invention relates to a device (217) for removing a needle protection cap (3) for an injection device (5) comprising a needle (21) and a removable protective cap (3). needle (21), the withdrawal member (217) comprising a housing (23) having a longitudinal axis (L) and being capable of receiving the cap (3) in a direction of insertion, the housing (23) being delimited by at least a first (213) and a second support zones (215) intended to serve as a support for the cap (3) housed in the housing (23), the first zone (213) being carried by a blocking element (1), the blocking element (1) being movable relative to the housing (23) between: an insertion configuration of the cap (3), in which the orthogonal projections of the first zone (213) and of the second zone (215) in a transverse plane substantially perpendicular to the longitudinal axis (L) are separated by an insertion distance (Di), and a locking configuration of the cap (3 ), in which the first zone (213) and the second zone (215) are located in separate transverse planes, and in which the orthogonal projections of the first zone (213) and of the second zone (215) in said transverse plane are separated by a blocking distance (Db), less than the insertion distance (Di) and capable of blocking the translation of the cap (3) relative to the withdrawal member (217) in an opposite direction of withdrawal in the sense of insertion. Figure for the abstract: [Fig. 16] L’invention concerne un organe de retrait (217) d’un capuchon (3) de protection d’aiguille, pour un dispositif d’injection (5) comprenant une aiguille (21) et un capuchon (3) amovible de protection d’aiguille (21), l’organe de retrait (217) comprenant un logement (23) présentant un axe longitudinal (L) et étant apte à recevoir le capuchon (3) selon un sens d’insertion, le logement (23) étant délimité par au moins une première (213) et une seconde zones d’appui (215) destinées à servir d’appui au capuchon (3) logé dans le logement (23), la première
