Device drug delivery it is having a proximal end and an opposite distal end, comprising: - a reservoir (12) of medicament comprising a plunger (11) movable, part (18) of neck and a unit (22) management item； - a housing (10) extending longitudinally along a longitudinal axis A and having one end (13) and open proximal end (15) opposite distal open； - a unit (14) arranged in the drive housing and distal end configured to apply a force on the movable plunger； - a body (16； 160) tubular C-shaped comprising a slit / gap (34) extending longitudinally so that said tubular-shaped body C can join the neck portion of said drug reservoir forming a unit tank, characterized in said tubular body in the form of C further comprises: - means of interior support configured to interact with the neck portion and the unit delivery element said drug reservoir so as to prevent said tank medication to move relative to the tubular body in the form of C, once the drug reservoir is attached to said tubular body C-shaped, and - means outer support configured to interact with corresponding means of support housing so which prevents said tubular shaped body C is moved relative to the housing once the tank unit is disposed within said clo amiento through the distal open end.Dispositivo de administración de medicamentos que tiene un extremo proximal y un extremo distal opuesto, que comprende: - un depósito (12) de medicamento que comprende un émbolo (11) móvil, una parte (18) de cuello y una unidad (22) de elemento de administración； - un alojamiento (10) que se extiende longitudinalmente a lo largo de un eje longitudinal A y que tiene un extremo (13) abierto proximal y un extremo (15) abierto distal opuesto； - una unidad (14) de accionamiento dispuesta en el extremo distal del alojamiento y configurada para aplicar una fuerza sobre el émbolo móvil； - un cuerpo (16； 160) tubular en forma de C que comprende una rendija/hueco (34) que se extiende longitudinalmente de manera que dicho cuerpo tubular
