The suction nozzle (2) comprises a sole (5) provided with a lower face (11), a suction channel (12) opening on the lower face (11) and extending transversely to a direction displacement (D2) of the suction nozzle, and a rear scraping rib (23) projecting from the underside (11) of the sole (5) and intended to scrape a soil to be cleaned, the scraping rib rearward (23) extending proximate and along a trailing edge (12b) of the suction channel (12). The sole (5) has bearing surfaces (22) arranged to contact the soil to be cleaned, and the rear scraping rib (23) is positioned back from the bearing surfaces (22).
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