Checking device for checking conformity of longitudinal parts extending predominantly in a direction of elongation (I-I), said checking device comprising: - means for fetching parts, comprising a pouring nose with guiding lateral walls (4a, 4b) and with a guiding bottom wall, the guiding bottom wall having a downward slope in a first direction (II-II) towards an end edge, - checking means for checking conformity of parts, - switching means, capable of switching the conforming parts to a first receptacle and of switching the non-conforming parts to a second receptacle, wherein: - said checking device comprises a transport wheel rotating about a third direction (IV-IV) parallel to the second direction (III-III), comprising a peripheral surface that is generally cylindrical with substantially circular cross-section in which is formed at least one radial housing shaped and dimensioned so as to receive one part at a time in a predetermined orientation, preferably with the direction of elongation (I-I) parallel to the third direction (IV-IV), - the transport wheel rotates in a direction such that, after passing in proximity to the end edge of the pouring nose, said at least one radial housing describes an ascending upper transport arc then a descending upper transport arc, - the checking means for checking conformity of parts are disposed so as to perform a conformity check on the parts in their displacement by the transport wheel between the pouring nose and the switching means, characterized in that: - the end edge is oriented in a second direction (III-III) for gravity to fetch the parts to said end edge, - the generally cylindrical peripheral surface of the transport wheel is disposed in proximity to the end edge of the pouring nose, so as to extract the parts contained in the pouring nose solely by the effect of gravity in receiving said parts in said at least one radial housing. - means for fetching parts, comprising a pouring nose with guiding lateral walls (4a, 4b) and with a guiding bottom wall, the guiding bottom wall having a downward slope in a first direction (II-II) towards an end edge, - checking means for checking conformity of parts, - switching means, capable of switching the conforming parts to a first receptacle and of switching the non-conforming parts to a second receptacle, - said checking device comprises a transport wheel rotating about a third direction (IV-IV) parallel to the second direction (III-III), comprising a peripheral surface that is generally cylindrical with substantially circular cross-section in which is formed at least one radial housing shaped and dimensioned so as to receive one part at a time in a predetermined orientation, preferably with the direction of elongation (I-I) parallel to the third direction (IV-IV), - the transport wheel rotates in a direction such that, after passing in proximity to the end edge of the pouring nose, said at least one radial housing describes an ascending upper transport arc then a descending upper transport arc, - the checking means for checking conformity of parts are disposed so as to perform a conformity check on the parts in their displacement by the transport wheel between the pouring nose and the switching means, - the end edge is oriented in a second direction (III-III) for gravity to fetch the parts to said end edge, - the generally cylindrical peripheral surface of the transport wheel is disposed in proximity to the end edge of the pouring nose, so as to extract the parts contained in the pouring nose solely by the effect of gravity in receiving said parts in said at least one radial housing.