Autoinjector comprising a body (1, 2), a reservoir (S) comprising a piston, said autoinjector comprising a piston rod (5) movable between a rest position and an injection position in which said piston rod (5) has moved the piston of the reservoir (S) to inject the fluid, a spring (6) being provided for urging said piston rod (5) towards its injection position, the autoinjector comprising a force control system (7). , 8) adapted to exert at least one force (F2) on said piston rod (5), said force (F2) being added to the force exerted by said spring (6) at the beginning of injection, said system comprising two pivoting members (7) cooperating with said piston rod (5), said pivoting members (7) being interconnected by two elastic members (8), said body (1, 2) having a sleeve (3), said pivoting members (7) being pivotally mounted on said sleeve (3) about fixed axes (79), said aut oinjecteur comprising an end of injection indicator formed by and / or fixed on said sleeve (3) and having an indication portion displaceable and / or deformable relative to said body (1, 2) to cooperate, after the end of the injection, with at least one viewing window. Autoinjecteur comportant un corps (1, 2), un réservoir (S) comportant un piston, ledit autoinjecteur comportant une tige de piston (5) déplaçable entre une position de repos et une position d'injection dans laquelle ladite tige de piston (5) a déplacé le piston du réservoir (S) pour injecter le produit fluide, un ressort (6) étant prévu pour solliciter ladite tige de piston (5) vers sa position d'injection, l'autoinjecteur comprenant un système de réglage de force (7, 8) adapté à exercer au moins une force (F2) sur ladite tige de piston (5), ladite force (F2) s'ajoutant à la force exercée par ledit ressort (6) en début d'injection, ledit système comprenant deux organes pivotants (7) coopérant avec ladite tige de piston (5), lesdits organes pivotants (7) étant reliés entre eux par deux éléments élastiques (8), ledit corps
