Job switching method and mounting line

A job switching method in a mounting line in which multiple mounting machines configured to mount components on a board are arranged in a conveyance direction of the board, the method comprising:

• when switching from a job producing a board of a first type to a job producing a board of a second type, performing, for a first mounting machine group from a most upstream mounting machine to a predetermined downstream mounting machine among multiple mounting machines constituting the mounting line, first job switching of switching jobs so that production of the board of the second type is started after mounting of components on the board of the first type is completed in all mounting machines in the first mounting machine group and a setup change is completed at least in a specific mounting machine in the first mounting machine group, and performing, for a second mounting machine group located downstream of the predetermined mounting machine, second job switching of switching jobs so that the production of the board of the second type is started after a setup change is executed in an upstream mounting machine in the second mounting machine group on which the mounting of components on the board of the first type is completed, in parallel with the mounting of components on the board of the first type by a downstream mounting machine in the second mounting machine group, and the setup change is completed.