A kind of medicine delivery device, comprising: cap is releasably secured to the main body of the medicine delivery device Needle assemblies are maintained in the cap And prestressing force deflection element, it is arranged between the cap and the needle assemblies, and be configured to make the needle assemblies relative to the medicine delivery device along distal direction deflection when the cap is fixed to the main body. One or more locking members, each locking member all have locked, wherein locking member prevents needle assemblies from engaging with main intracorporal cylindrantherae is maintained in the latched position. Cap is configured in initial position locking member to be maintained in latched position, and in middle position to discharge locking member to allow needle assemblies to engage with cylindrantherae.
