A second-stage regulator for scuba divers wherein the inhalation effort is reduced with respect to the known regulators thanks to the reduction of the friction between some components thereof. Coaxially to the regulator poppet (8) there is provided a flexible sleeve (33) sealingly connected to the poppet and the baffle (10), so as to avoid blow-by of gaseous mixture through the baffle opening through which there extend the tail (9) of the poppet (8) connected to the lever (16) of the regulator extending in the outlet chamber (3) thereof. The poppet head (7) is placed in ferrule (42) with an at least part-circular profile abutting against the inner part of the intermediate chamber (2) to allow the poppet oscillation. The lever end (15) contacting the diaphragm (13) separating the outlet chamber (3) from the outside has an arched shape with a profile such as the length of the arch between two adjacent contact points (A', B') measured on the lever is equal to the length of the segment between the same adjacent contact points (AB) measured on the diaphragm.
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