A bone biopsy device includes an outer cannula having a mouth with a cutting edge to section a frustule of spongy bone, a plate mounted slidably within the cannula with a semi-cylindrical portion at its end, and a stylet mounted slidably within the plate and having a pointed tip protruding from the mouth of the cannula to pierce the bone. The mouth has a narrowing and the semi-cylindrical part of the plate has at its end at least one pair of opposed lunettes/anchorages bendable, with respect to a horizontal plane, towards the interior of the semi-cylindrical portion when they encounter the narrowing of the mouth, thereby occluding the lumen of the plate and clasp the base of the sectioned frustule and allow extraction of the frustule by way of the plate whilst the cannula is kept at the operating site, allowing aspiration of marrow after the frustule has been removed.
