Drug delivery device and retaining member for a drug delivery device

A drug delivery device comprising:

• a housing;
• a mechanical assembly at least partially accommodated in the housing;
• and
• a retaining member for retaining the mechanical assembly in the housing, the retaining member being axially and rotationally fixed to the housing such that axial and rotational movements of the retaining member relative to the housing are prevented,
• wherein the retaining member is engaged with the housing,
• wherein a connection strength of the retaining member with the housing is larger than a connection strength of the retaining member with the mechanical assembly such that the retaining member is configured to be disengaged from the mechanical assembly when the mechanical assembly or parts thereof are forcefully separated from the housing, the disengagement of the retaining member from the mechanical assembly leading to a damage of the mechanical assembly and/or the retaining member such that the drug delivery device is configured to be damaged when the mechanical assembly or parts thereof are forcefully separated from the housing,
• wherein the retaining member is threadedly engaged with the mechanical assembly and comprises an inner thread for engagement with an outer thread of the mechanical assembly,
• wherein the mechanical assembly comprises an indicator member for displaying a size of a dose of a drug to be dispensed, and
• wherein the retaining member is engaged with the indicator member.