An autoinjector comprising a lower body (10) receiving a tank, said tank containing fluid product and comprising a piston and a needle, such as a pre-primed syringe (A), said autoinjector comprising: injection means (5, 8) to inject said fluid product through said needle when said needle is in an injection position； and a tank movement device (2, 4, 9) for retracting said needle out of the body of the user after injection of the fluid product, a trigger (19), actuated by said injection means, actuating said tank movement device (2, 4, 9) after injection of the fluid product so as to retract said needle； said autoinjector comprising a retarding device (15, 16, 17) adapted to delay during a predetermined time the actuation of said tank movement device (2, 4, 9) by said trigger (19) after injection of the fluid product, to delay retraction of said needle by said predetermined time after the end of injection.
