The present invention relates to a medicament container retaining mechanism (32) for a medicament delivery device (10) comprising at least one flexible retaining member (34) arranged to a housing part (12) of said medicament delivery device (10), which housing part (12) is configured to receive a generally tubular medicament container (22) therein； and wherein said at least one flexible retaining member (34) is configured to interact with an outer surface of said medicament container (22) received therein, whereby said at least one flexible retaining member (34) is configured to exert lateral clamping forces to said medicament container (22) to prevent movement in the generally lateral direction of said medicament container in said housing part (12).本發明有關用於藥物輸送裝置(10)之藥物容器固定機構(32)，包括至少一撓性固定構件(34)，被配置至該藥物輸送裝置(10)的外殼部分(12)，該外殼部分(12)被建構成在其中承納一大致上管狀之藥物容器(22)；及其中該至少一撓性固定構件(34)被建構成與在其中所承納之藥物容器(22)的外表面互相作用，藉此該至少一撓性固定構件(34)被建構成施加橫側夾緊力量至該藥物容器(22)，以防止該藥物容器於該外殼部分(12)中之大致上橫側方向中的運動。
