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 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 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 . <EOS>