The present invention relates to a capsule for perfuming material provided with an improved closure ar- rangement. According to the invention, the capsule com- prises a body and a cover both made of a substantially rigid material. The upper edge of the cover has a project-5 ing tooth which co-operates with the groove of the cover that receives the upper edge for obtaining a coupling with interference fit along one or more portions of the groove, so as to prevent accidental opening of the capsule. In or- der to allow coupling of the cover with the body during 10 manufacturing, windows are formed in the cover at said one or more portions of the groove, so as to locally give a certain flexibility to the cover.
