each other by tie bars 214 the lead frame having the above described structure can be easily formed by punching out an aluminum plate fig3 is a perspective view 2 of the lead frame 210 tip ends of the control leads 211 and the power leads 212 undergo press working to have a crank shape thereby a terminal is formed fig4 a u2013 4c and 6 f u2013 6 g are explanation views showing an assembling method of the connecting structure of printed circuit boards according to the embodiment of the invention the lead frame 210 which has undergone the press working is fixed to the power substrate 21 by soldering in addition in the figures subsequent to fig4 c in order to easily understand the figures one control lead 211 and one power lead 212 are shown however as shown in fig2 and 3 even in case that a plurality of control leads 211 and power leads 212 are disposed this assembling method is also applicable thereto at this stage since the control lead 211 and the power lead 212 are fixed to the frame 213 if the frame 213 is positioned with respect to the power substrate 21 there is no necessity to position each of the control lead 211 and the power lead 212 with respect to the power substrate 21 on the power substrate 21 formed are connecting pads 215 to which terminals of the control lead 211 and the power lead 212 are attached the terminals and the.