Further, positioning hole 71 is provided at a specified position of circuit board 70. Electronic component 80 further includes pin section 84a that is inserted into positioning hole 71. The reference section (first reference section 84) includes regulating surface 84b that contacts an upper surface of circuit board 70 when pin section 84a is inserted by a specified amount into positioning hole 71, such that relative movement of pin section 84a with respect to positioning hole 71 is regulated. Measuring device 50 measures the position of at least one reference point 91 set on regulating surface 84b of the multiple reference points 91. According to such a configuration, electronic component 80 is positioned with respect to circuit board 70 by pin section 84a being inserted into positioning hole 71. With such an electronic component 80, regulating surface 84b contacts an upper surface of circuit board 70 so as to regulate relative movement of pin section 84a with respect to positioning hole 71 such that pin 84a is not inserted into positioning hole 71 by greater than the specified amount. Also, first reference section 84 of electronic component 80 is configured to include the above regulating surface 84b, and measuring device 50 measures the positions of reference points 91 set on regulating surface 84b among the multiple reference points 91. Thus, because calculations are made based on reference points 91 of regulating surface 84b that reliably contact an upper surface of circuit board 70 when reference surface 86 is mounted on circuit board 70, it is possible to determine the suitability of electronic component 80 with greater accuracy.