| 摘要 |
PROBLEM TO BE SOLVED: To provide a multi-substrate circuit device exhibiting an excellent safety from leakage while suppressing increase in costs. SOLUTION: The multi-substrate circuit device is provided with a photocoupler 313 having low-potential terminals 3131 and 3132 to which a low potential is applied, and high-potential terminals 3133 and 3134 to which a potential higher than that applied to the low-potential terminals is applied; and a low-potential side circuit board 32 mainly having low-potential conductor patterns 37 and 38 to which a low potential is applied, and a high-potential side circuit board 31 mainly having high-potential conductor patterns 39 and 40 to which a high potential is applied. The low-potential terminals 3131 and 3132 of the photocoupler 313 are fixed on the low-potential conductor patterns 37 and 38 of the low-potential side circuit board 32, and the high-potential terminals 3133 and 3134 of the photocoupler 313 are fixed on the high-potential conductor patterns 39 and 40 of the high-potential side circuit board 31.
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