When determining whether an insertion component (41) provided with a positioning-use protruding section (42) and a surface-mounting-use electrode section (45) can be mounted onto a circuit board (43) provided with a positioning hole (44) into which the positioning-use protruding section is inserted and a land (46) for connecting the surface-mounting-use electrode section, an image is captured of the positioning-use protruding sections and the surface-mounting-use electrode sections of the insertion component either separately or simultaneously by a component imaging camera (16), and the positions of the positioning-use protruding sections and the positions of the surface-mounting-use electrode sections are recognized by processing the captured image. Then, based on an assumption that positioning-use protruding sections of the insertion component are inserted into positioning holes of the circuit board, the position deviation amount between the surface-mounting-use electrode sections of the insertion component and the lands of the circuit board is calculated, and by determining whether the position deviation amount is within a tolerance range, it is determined whether the insertion component can be mounted on the circuit board.
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