Patent ID: 7883378

Claim:
An electronic device including a first board having a first wiring layer and a through-hole electrically connected to the first wiring layer and an external connection terminal having a pin terminal having a substantially flat plane provided in a connection part which is resiliently deformed easier than other parts, the electronic device having press-fit connection structure formed by press-fitting the connection part of the pin terminal into the through-hole of the first board, wherein an inner diameter of the through-hole of the first board at a connection part positioned at a middle part in a thickness direction of the first board is smaller than that at obverse and reverse surfaces of the first board, a length of the middle part having the smaller inner diameter in the thickness direction of the first board is shorter than a length of the substantially flat plane of the pin terminal in the thickness direction of the first board, a peripheral edge part of the through-hole of the first board on the insertion side of the in terminal is chamfered at a predetermined angle to the substantially flat plane of the inner wall of the through-hole, and a peripheral edge part of the through-hole of the first board on a reverse side to the insertion side of the in terminal is chamfered at a predetermined angle to the substantially flat plane of the inner wall of the through-hole.