Line setting device and component mounter provided with same

A line setting device for setting lines in a captured image in which a component to be mounted by a component mounter is captured, the line setting device comprising:

• a tentative line setting section configured to set tentative lines at multiple locations of the component based on a design value of the component;
• a first captured image input section configured to input the captured image of the component;
• a first determination section configured to, for each of the tentative lines at the multiple locations set by the tentative line setting section, determine whether a boundary between high-luminance pixels and low-luminance pixels is detectable with respect to a pixel group on the tentative line in the captured image input by the first captured image input section;
• and
• an actual line determination section configured to not determine the tentative lines, for which the boundary is determined to be undetectable by the first determination section, as actual lines, and to determine the tentative lines, for which the boundary is determined to be detectable by the first determination section, as the actual lines.