The present invention relates to an injection needle assembly (16, 116, 216, 316, 416) for use in a medicament delivery device (10). The injection needle assembly comprises an injection needle holder (27), an injection needle (17) fixed to said injection needle holder (27), the injection needle (17) having a proximal end (18) and a distal end (19), and a sealing assembly (25) for sealing the distal end (19) of the injection needle (17). The sealing assembly (25) comprises a spacer element (31) surrounding the distal end (19) of the injection needle (17) and a sealing membrane (32) for sealing the distal end (19) of the injection needle (17).
