Autoinjector comprising a body (1) and an actuator sleeve (10) displaceable relative to said body (1), said actuator sleeve (10) being in a first projected position before actuation of the autoinjector and in a second projected position after actuation of the the autoinjector, one of said actuator sleeve (10) and said body (1) having a flexible tab (110) adapted to deform laterally with respect to said actuator sleeve (10) and / or relative to said body (1) when said actuator sleeve (10) is moved from its first projected position to its actuating position and then from its actuating position back to its second projected position, the other of said actuator sleeve (10) and said body (1 ) having an initial zone (102) which cooperates with said flexible tab (110) in said first projected position, an intermediate zone (105) which cooperates with said flexible tab (110) in said ac position tion, and a final receiving area (106) which cooperates with said flexible tab (110) in said second projected position, said final receiving area (106) being offset at least laterally from said initial area (102), an axial wall deformable member (1020) being adapted to deform elastically to pass said flexible tab (110) from said initial zone (102) to said intermediate zone (105), said deformable axial wall (1020), in its undistorted position, being then adapted to guide said flexible tab of said intermediate zone (105) to said final receiving area (106). Autoinjecteur comportant un corps (1) et un manchon actionneur (10) déplaçable par rapport audit corps (1), ledit manchon actionneur (10) étant dans une première position projetée avant actionnement de l'autoinjecteur et dans une seconde position projetée après actionnement de l'autoinjecteur, l'un parmi ledit manchon actionneur (10) et ledit corps (1) comportant une patte flexible (110) adaptée à se déformer latéralement par rapport audit manchon actionneur (10) et/ou par rapport audit corps (1) lorsque ledit manchon actionne
