Device for dispensing a fluid substance

A device (1) for dispensing a fluid substance(S) comprising a cup-shaped body (3) equipped, in correspondence with a bottom (2) of the cup-shaped body, with a first valve element (4) which intercepts a suction passage (5) of said fluid substance in a compression chamber (6), a closing element (7) of the cup-shaped body (3) equipped with a window (8), a dispensing button (15) and a shaped element (9) functionally coupled to the dispensing button (15) for movement of the dispensing button inside the cup-shaped body (3), the shaped element (9) comprising a flange portion (10) configured to slide on an internal wall (3A) of the cup-shaped body, from the flange portion (10) extending a deformable portion (11) which, when free of deformation, is bell-shaped, the deformable portion (11) being elastically deformable, said deformable portion (11) defining, at least together with a part of the cup-shaped body (3), said compression chamber (6), the cup-shaped body (3) having a tubular projection (18) equipped with an opening (18A) which cooperates with a shutter (19) extending from said flange portion (10) and which closes said opening (18A) at least when the dispensing device is at an upper stroke limit point.