Inspection equipment for screw part of bottle-can having a mouth section provided with a curl portion in which an opening edge thereof is rolled up outward and the screw part for fitting a cap by threads below the curl portion for attaching a cap with a liner, the inspection equipment is arranged to inspect a shape of the screw part of the mouth section by imaging an imaging area (a) which is set so as to include a part of the mouth section while rotating the bottle-can around a can-axis (X), the inspection equipment comprising: a rotating device for holding and rotating the bottle-can around the can-axis (X); characterized by a thread-illumination device which is arranged to irradiate an illumination light (A) toward an inclined surface of lower part than a ridgeline of the screw part of the bottle-can , diagonally upward from a radially outside and can-axially lower part; an imaging device for continuously obtaining inspection images including reflected light (A') of the illumination light (A) at the imaging area (a), wherein the lower inclined surface than the ridgeline of the screw part is imaged with emphasis by irradiating the illumination light (A); and a thread-inspection device for inspecting the screw part including a thread-starting part which is arranged to detect the thread-starting part of the screw part based on an imaging result of the reflected light (A'), and the thread-inspection device is configured to detect an upper edge (Dc) of the image which indicates the ridgeline of a thread ridge , whereby the end part (Da) of the thread ridge can be recognized by a figure of a boundary between the high-brightness part and the low-brightness part by the reflected light (A') in the inspection image; whereby by detecting the positions of both the end parts (Da and Db) of the upper edge (Dc) of the image (D), it is possible to specify the positions of the thread-starting part and the thread-ending part on the ridgeline of the thread ridge . a rotating device for holding and rotating the bottle-can around the can-axis (X); characterized by a thread-illumination device which is arranged to irradiate an illumination light (A) toward an inclined surface of lower part than a ridgeline of the screw part of the bottle-can , diagonally upward from a radially outside and can-axially lower part; an imaging device for continuously obtaining inspection images including reflected light (A') of the illumination light (A) at the imaging area (a), wherein the lower inclined surface than the ridgeline of the screw part is imaged with emphasis by irradiating the illumination light (A); and a thread-inspection device for inspecting the screw part including a thread-starting part which is arranged to detect the thread-starting part of the screw part based on an imaging result of the reflected light (A'), and the thread-inspection device is configured to detect an upper edge (Dc) of the image which indicates the ridgeline of a thread ridge , whereby the end part (Da) of the thread ridge can be recognized by a figure of a boundary between the high-brightness part and the low-brightness part by the reflected light (A') in the inspection image; whereby by detecting the positions of both the end parts (Da and Db) of the upper edge (Dc) of the image (D), it is possible to specify the positions of the thread-starting part and the thread-ending part on the ridgeline of the thread ridge . <EOS>