An injection device (110), comprising: a housing (112) adapted to receive a syringe (114) having a discharge cannula (118), the housing having an indication opening (113)； a forward drive mechanism (130) arranged to act on the syringe after actuation to advance the syringe from a retracted position to an extended position, thereby discharging the contents (124) of the syringe through the discharge cannula ； a recoil drive mechanism arranged to act on the syringe after the contents of the syringe has been discharged to retract the syringe from the extended position to the retracted position, the recoil drive mechanism being arranged in the housing (112), of in a manner that does not hinder an inspection of the contents of the syringe (114) through the indication opening (113)； a support member in juxtaposition in contact with the housing (112), in which the recoil drive mechanism is supported by the support member and the support member comprises, on its inner surface, a support surface (122a) for the recoil drive mechanism； a syringe holder (127) sized to contain the syringe； and characterized in that the support member is transparent and is placed between the indication opening (113) and the syringe (114) and has the shape of a cylindrical insert (122) sized to contain the syringe (114), in which the cylindrical insert (122) is sized to contain the syringe holder (127) and in which a first end of the recoil drive is in juxtaposition in contact with the support surface (122a) and a second end of the drive mechanism The recoil is in juxtaposition in contact with the support (127) of the syringe, in which the support surface (122a) is positioned beyond the indication opening (113) away from a proximal end (101) of the housing (112).Un dispositivo (110) de inyección, que comprende: un alojamiento (112) adaptado para recibir una jeringa (114) que tiene una cánula (118) de descarga, teniendo el alojamiento una abertura (113) de indicación； un mecanismo impulsor (130) de
