An electric wire connection device is provided to have members whose connection is difficult to cut even though the member are pulled out toward both sides and which are easy to assemble and disassemble and permanently used. A left side wire inserting unit(100) is a member into which an uncoated wire of a left piece is inserted among wires of both sides which need wire connection work. A right side wire inserting unit is a bar type member into which an uncoated wire of a right piece is inserted. The right side wire inserting unit is contained and connected to the left side wire inserting unit. A left side cover unit(500) is connected with another cover member. A right side cover unit(700) is connected with the left side cover unit.
