The device comprises a receptacle (1) that defines a neck (2), wherein a liquid that impregnates diffusion means (3, 4) is housed inside the receptacle (1), and is characterised in that said diffusion means comprise a flexible band (3) and a rigid band (4) in contact with each other, the flexible band (3) being in contact with the liquid inside the receptacle； the device also comprises an inner closing element (5) that fits tightly inside said neck (2) and a regulation element (6) complementary to said inner closing element (5), wherein the rigid band (4) is associated with said regulation element (6), the position of which determines the surface of the rigid band (4) arranged on the outside of the receptacle (1). It makes it possible to accurately regulate the exposed surface of the rigid band, thereby regulating the intensity of the perfume in a room.
