Work machine and method for determining polarity

A method for determining polarity for a work machine comprising a head section configured to hold and move a lead component with having a main body section, a pair of leads provided at a bottom of the main body section, and a mark portion indicating polarity of the pair of leads, and an imaging device configured to image the bottom of the lead component held by the head section;

• the method for determining polarity being configured to determine the polarity of the pair of leads,
• the method comprising;
• a lead position detecting step of detecting, based on imaged data imaged by the imaging device, a lead position which is positions of the pair of leads;
• a first detecting region setting step of setting, based on the lead position detected by the lead position detecting step, a first detecting region constituting a region outside the pair of leads with including a part of the bottom section;
• a second detecting region setting step of setting a second detecting region constituting a region outside the pair of leads, being opposed to the first detecting section across the pair of leads with including a portion of the bottom section outside the pair of leads;
• and
• a polarity determining step of determining the polarity of the pair of leads based on whether the mark portion exists in each of the first detecting region and the second detecting region.