Next, plane calculating section 63 performs a plane calculating process of calculating reference plane 86 of electronic component 80 based on the positions of the multiple reference points 91 (S32). Specifically, plane calculating section 63 calculates reference plane 86 as a plane including a straight line that passes through the two reference points 91 and a straight line perpendicular to that line and parallel to the horizontal plane (XY plane). Continuing, suitability determining section 64 performs a suitability determining process for electronic component 80 based on the distances between reference plane 86 and measured points 92 set on each of the multiple electrodes 82 (S33).

Suitability determining section 64, if determining that all the measurement points 92 set on each of the multiple electrodes 82 are within tolerance range Tc, determines that the electronic component 80 is suitable for mounting processing (S34: yes). On the other hand, if determining that one of the measurement points 92 set on each of the multiple electrodes 82 is not within tolerance range Tc, suitability determining section 64 determines that the electronic component 80 is not suitable for mounting processing (S34: no). Then, component determination device Dp requests recovery processing with respect to control device 60 (535) and ends suitability determining with respect to the electronic component 80.