Injection device comprising a housing (2, 3, 4, 5), a storage support (10) disposed within said housing, said storage support (10) being configured to accommodate a drug reservoir (12) having a needle (13) attached to one end thereof and a cap disposed in a sealed and sliding manner within said medicament reservoir (12) at the other end thereof, an actuation unit comprising a piston rod (60) and piston drive means (50, 70), the piston drive means (50, 70) being slidably disposed relative to the piston rod (60), being locked in rotation to the piston rod (60) and it can rotate in relation to the housing (2, 3, 4, 5), said drive unit further comprising a first energy accumulation element (40) disposed inside the housing of the injection device (1, 100, 200) and adapted to accumulate ular and store energy, wherein said piston drive means (50, 70) are operatively associated with said first energy accumulation element (40), in which the piston drive means (50, 70) can be released so that due to an output torque of said first energy accumulation element (40), the piston drive means (50, 70) is allowed to rotate and the piston rod (60) is driven towards the proximal end of the injection device (1, 100, 200) whereby an injection is performed, and a rotary injection indication mechanism (180, 280) configured to indicate to the user the progress of the injection, in which the mechanism (180, 280) of rotary injection indication comprises a signaling element and a drive mechanism for actuating said signaling element in rotation, said drive mechanism being coupled to said actuation means (50, 70) piston ionization at the distal end of said piston actuation means (50, 70), said rotary injection indication mechanism (180, 280) being arranged so that the progress of the injection is shown through at least one opening provided at least on a distal end surface of the housing.Dispositivo de inyección que comprende un alojamiento (2, 3, 4, 5), un soporte (10) de depósito dispuesto dent
