The present invention refers to adjustable
volatile substance diffuser devices, more specifically to diffusers incorporating a container with a
semipermeable membrane (3, 23, 43, 63). Said membrane (3, 23, 43, 63) permits the issue of vapours but prevents the escape of liquids, with the result that an extremely clean device is achieved as the
spillage of liquid is prevented in the case of inappropriate handling. The device (1, 21, 41, 61) is furthermore of very simple construction, as it is made up of two parts, a container (2, 22, 42, 62) which houses the
volatile substance and a housing (4, 24, 44, 64), which supports said container (2, 22, 42, 62). The container (2, 22, 42, 62) has the membrane (3, 23, 43, 63) adhered to it. The container (2, 22, 42, 62) and the housing (4, 24, 44, 64) are coupled directly to each other and they are moved by means of guiding or articulation. The container (2, 22, 42, 62) may comprise a useful part (16), which defines the cavity (5) holding the
volatile substance, and a non-useful part (6).