An auto-
injector comprising: - a body (1) receiving a reservoir (S), said reservoir (S) containing fluid product and comprising a
piston (P), in the same way as a pre-filled
syringe, - a
piston rod (5) suitable for cooperating with the
piston (P) of said reservoir (S), said
piston rod (5) being movable by an injection spring (8) between a loaded position and an injection position in which said
piston rod (5) has moved the piston (P) of the reservoir (S) in order to inject the fluid product into an
injection site, - a visual, audio and / or tactile indicator device, for indicating to the user that he can remove said auto-
injector from said
injection site, said auto-
injector comprising a
delay system for delaying the actuation of said visual, audio and / or tactile indicator device relative to the end of the injection, said
delay system comprising a reservoir (16) containing a fluid, a piston (19) being disposed in said reservoir (16), one of said reservoir (16) and said piston (19) being movable in translation in said body (1) when said
delay system is actuated, and the other of said reservoir (16) and said piston (19) being fixed relative to said body (1) when said delay system is actuated, the translational movement of one relative to the other moving said fluid out of said reservoir (16), through at least one flow passage (161; 195), such that said translational movement is braked, said delay system comprising said reservoir (16) containing said fluid, said piston (19), a delay spring (18) attached to said piston (19) and to said body (1), a locking key (20) and said
piston rod (5). Figure to be published: figure 1b