Described is a medicament delivery device (1) comprising a case (2) adapted to hold a container (3) of a medicament, a drive mechanism (5) adapted to expel the medicament from the container (3), and a trigger button (6) disposed on the case (2) and operably coupled to the drive mechanism (5). The trigger button (6) has a concave position and a convex position. Movement of the trigger button (6) from the convex position to the concave position causes activation of the drive mechanism (5).
