Contact block includes with the contact which includes the contact piece of the pair which puts in place interval and the electric insulated connection block which connects the said contact piece. Each contact piece the folding end which turned back from the said folding end making interval top and bottom direction has with the 1st advanced territory which from the intermediate territory of side U letter condition or the side V letter condition which possesses the arm of the pair which extends and the point on the one hand of the arm extends to the lower part and the 2nd advanced territory which from the point of the other arm extends to the upper part. The folding end of both contact piece has been buried while connection blocking, the remainder of both contact piece is extended from connection block. Because of this, it can exchange the contact by exchanging the position deciding and contact block the contact which is adjacent in a state where it is assembled in the electric connected device, with connection block.
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