The present invention relates to a device (10) for training respiratory muscles comprising:- one or more vertical chambers (11a, 11 b, 11c) with at least one aperture (12a, 12b, 12c) in their lower sections in order to place the interior of the chamber in communication with the outside environment, and an aperture in their upper wall (13a, 13b, 13c) to place the chamber in communication with a common conduit (14)- a mobile obstacle (15a, 15b, 15c) in each vertical chamber, of similar cross-section and dimensions lower than those of the chamber, so that said obstacle does not completely obstruct the cross-section of the chamber- an aperture (16) in said common conduit, to which a tubular fitting (17) is connected- a flexible tube (20) fitted to said tubular fitting, with a mouthpiece (21) at the end opposite to that fitted to the tubular fitting and- a connector (18 18a 18b 18c 50) inserted between the tubular fitting and the flexible tube, inside of which a particle filter (19) is housed, and comprising a retaining element for said filter downstream of it, along the direction of the flow of air inside the device when this is in use.
