The present invention relates to an aerochamber for inhalation of medicinal products in aerosol for the treatment of respiratory ailments. The aerochamber includes a tubular body including a proximal end with a front cover adapted to mount a mask to cover a mouth and a nose of a patient a distal end with a rear cover adapted to connect to a container with a pressurized pharmaceutical solution to be inhaled, the rear cover includes an annular wall including a hole that matches with an opening on the distal end a translucent cap having a front wall, an inside wall, a cavity, an opening on the front wall, the translucent cap is placed on a section of the annular wall of the rear cover an inhalation sensor housed on the cavity of the translucent cap. The inhalation sensor includes an indication valve having: a flexible tab, the flexible tab has a lower end secured to the rear cover, the flexible tab is located between the opening of the front wall of the translucent cap and the hole of the annular wall of the rear cover a flange having an inverted U shape secured to a section of the flexible tap and an upper flange projecting from the inside wall of the translucent cap and defining a bumper limiting a maximum angular displacement of the flexible tab in a working position.
