The present invention relates to a safety pen needle device comprising a generally tubular hub having a proximal and a distal end, said hub comprising attachment means arranged at its distal end for attaching the safety pen needle device to a medicament container assembly, and a coaxially arranged needle attachment member； an injection needle having an injection end and a non injection end, said injection needle being attached inside said hub and extending through the needle attachment member； wherein said device further comprises a generally tubular rotatable sleeve rotatable arranged on said hub, said rotatable sleeve comprising on its outer circumferential surface at least one guide track comprising flexible means； a generally tubular needle shield slidably arranged on said rotatable sleeve, said needle shield comprising at least one guide protrusion on its inner circumferential surface, wherein said at least one protrusion is arranged to interact with said at least one guide track and with said flexible means； and resilient means co-acting with said needle shield for urging said needle towards the distal end of the device.
