A work machine including: a tape feeder with taped lead components having multiple leads to supply the lead components in a state of being detached from the taped components extended to a supply position; a mounting head to mount the lead components supplied by the tape feeder onto a board; an imaging device; and a control device having an imaging section to image an identification object, the identification object being on the taped components and capable of identifying the polarity of each of the multiple leads, and a determination section to determine whether an actual polarity disposition, which is the polarity disposition of each of the multiple leads, and a set polarity disposition, which is the polarity disposition of each of the multiple leads set in advance, match each other based on image data obtained by imaging with the imaging section.