The diffuser (1) comprises two outer walls (2a, 2b), with outer (3a) and inner (3b) faces, one of which is permeable to the volatile substance, one with a deformable trigger zone (7) following a triggering pressure. Manually exerted by the user to trigger the broadcast； an inner plate (6) between the two outer walls (2a, 2b), the assembly being integral, provided with interstices (10) communicating and opening, compressible transversely, and providing in it a housing (12) receiving and now in position a capsule of volatile substance (13)； and a volatile substance capsule (13) which, having its integrity, encloses a volatile substance, and is adjacent to the inner plate (6) and the permeable outer wall (2a, 2b), which is capable of being broken by means of the triggering pressure, thereby releasing the volatile substance, so that, before implementation, the volatile substance capsule (13) has its integrity, and to trigger the diffusion of the volatile substance, the user exerts the triggering pressure on the deformable trigger zone (7) corresponding to the capsule (13), which breaks it and releases the volatile substance that diffuses towards the inner face (3b) of the permeable outer wall (2a, 2b), on the one hand directly, on the other hand indirectly through the interstices (10) communicating and opening the inner plate (6), then diffuses through the permeable outer wall (2a, 2b) and then into the surrounding atmosphere. Le diffuseur (1) comporte deux parois extérieures (2a, 2b), avec faces extérieure (3a) et intérieure (3b) dont une perméable à la substance volatile, une avec une zone de déclenchement déformable (7) suite à une pression de déclenchement exercée manuellement par l'utilisateur pour déclencher la diffusion ； une plaque intérieure (6) entre les deux parois extérieures (2a, 2b), l'ensemble étant solidaire, pourvue d'interstices (10) communicants et ouvrants, compressible transversalement, et ménageant en elle un logement (12) recevant et main
