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1. A nasal powder delivery device comprising a reservoir containing at least one dose of powder, a nasal delivery head intended to be inserted in a nostril of a user, said nasal delivery head comprising a delivery aperture, and an air discharge system generating, upon actuation of said nasal powder delivery device, a flow of compressed air to deliver a dose of powder in said nostril through said delivery aperture, said air discharge system comprising an air chamber, formed by a hollow axial cylinder and a piston which, upon actuation of the device, sealingly slides in said air chamber to compress the air contained in said air chamber, said hollow axial cylinder comprises a radial shoulder which connects a first cylinder portion of larger diameter and a second cylinder portion of smaller diameter, said piston being arranged before actuation at said first cylinder portion, and upon actuation, said piston sealingly cooperates with said second cylinder portion, to compress the air contained in said air chamber, and thus generate the flow of compressed air, said radial shoulder defining in said hollow axial cylinder, a profile that said piston must overcome at the start of actuation, said piston comprising an upper lip and a lower lip, a skirt being arranged around said hollow axial cylinder, said skirt comprising, in the vicinity of its axially lower edge, a lower flange, which radially projects inwards, characterised in that said skirt comprises, in the vicinity of said lower flange, at least one profile, which radially projects inwards cooperating before actuation with said lower lip of said piston.
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