Autoinjector comprising a body (1) adapted to receive a reservoir (S), said autoinjector comprising an actuator sleeve (10) having a contact end (11) intended to come into contact with the body of the user, said actuator sleeve ( 10) extending at least partially within said body (1) and being movable relative to said body (1) between projected positions, wherein said actuator sleeve (10) at least partially projects out of said body (1 ), and an actuating position, in which said actuator sleeve (10) is axially displaced inwardly of said body (1), said actuator sleeve (10) being in a first projected position before actuating the autoinjector and in a second projected position after actuation of the autoinjector, said actuator sleeve (10), in said second projected position, extending more axially out of said body (1) than in said first projected position, said actuator sleeve (10) having an annular zone (12) which, in said first projected position, is disposed inside said body (1) and which, in said second projected position, is disposed at the outside said body (1), said annular zone (12) having a visual indicator (15) to indicate to the user that the autoinjector has been actuated, said actuator sleeve (10) having, axially adjacent to said annular zone (12)； ), a shoulder (16) radially outwardly projecting, said shoulder (16) projecting radially outwardly with respect to said visual indicator (15), thereby shielding said visual indicator (15) against contact with the inner surface of the body (1) during movements of the actuator sleeve (10) in said body (1). Autoinjecteur comportant un corps (1) adapté à recevoir un réservoir (S), ledit autoinjecteur comportant un manchon actionneur (10) comportant une extrémité de contact (11) destinée à venir en contact avec le corps de l'utilisateur, ledit manchon actionneur (10) s'étendant au moins partiellement à l'intérieur dudit corps (1) et étant déplaçable par rapport audit corps (1) entre des positions projetées, d
