A medicament delivery device comprising: a tubular housing having a proximal end and an opposite distal end; drive means configured to act on a medicament container for expelling a medicament; holding means configured to hold said drive means in a pre-tensioned state; activation means configured to interact with said holding means for releasing said drive means from the pre-tensioned state, wherein the activation means is a tubular activation member slidably and coaxially arranged in relation to the tubular housing; wherein the holding means are a tubular extension part fixedly connected to the distal end of the tubular housing and a tubular operation member which is interactively connected both to the tubular extension part and to the tubular activation member, such that when said tubular activation member is pressed against a delivery site said tubular operation member is rotated in relation to said tubular extension part whereby said drive means are released from the pretensioned state; feedback means configured to interact both with said holding means and with said drive means for generating an audible and/or tactile and/or visual signal indicating that the medicament has been completely expelled, characterized in that said feedback means is a longitudinally extending signal generating member including an elongated U-shaped bracket comprising a transversal wall and two longitudinally extending flexible arms provided with angled support members extending radially outward, and wherein said support members are adapted to rest on an annular proximal end of the tubular extension part when the drive means are in the pre-tensioned state, and wherein the transversal wall of the U-bracket is arranged at a predetermined distance D from an inner proximal surface of said tubular extension part when the drive means are in the pre-tensioned state and contacts therewith by a remaining force exerted by the drive means when the drive means are in the released state and the medicament has been completely expelled, thereby generating said signal. a tubular housing having a proximal end and an opposite distal end; drive means configured to act on a medicament container for expelling a medicament; holding means configured to hold said drive means in a pre-tensioned state; activation means configured to interact with said holding means for releasing said drive means from the pre-tensioned state, wherein the activation means is a tubular activation member slidably and coaxially arranged in relation to the tubular housing; wherein the holding means are a tubular extension part fixedly connected to the distal end of the tubular housing and a tubular operation member which is interactively connected both to the tubular extension part and to the tubular activation member, such that when said tubular activation member is pressed against a delivery site said tubular operation member is rotated in relation to said tubular extension part whereby said drive means are released from the pretensioned state; feedback means configured to interact both with said holding means and with said drive means for generating an audible and/or tactile and/or visual signal indicating that the medicament has been completely expelled, characterized in that said feedback means is a longitudinally extending signal generating member including an elongated U-shaped bracket comprising a transversal wall and two longitudinally extending flexible arms provided with angled support members extending radially outward, and wherein said support members are adapted to rest on an annular proximal end of the tubular extension part when the drive means are in the pre-tensioned state, and wherein the transversal wall of the U-bracket is arranged at a predetermined distance D from an inner proximal surface of said tubular extension part when the drive means are in the pre-tensioned state and contacts therewith by a remaining force exerted by the drive means when the drive means are in the released state and the medicament has been completely expelled, thereby generating said signal.