To provide a connection part for a power cable, wherein a trace amount of a very small solid metal powder which is generated when the connection terminal part of an OF cable is cut, and which is left inside the connection part without being left completely even in a connecting construction operation, can be made not to circulate inside the insulating oil of the OF cable.

In this connection part for a power cable, an annular oil groove (an OF-cable side annular oil groove) 105 is formed on the inner circumferential face of a cable terminal connection worked part insertion hole 103 at the connection part for the power cable, which is formed in such a way that the terminal connection worked part of an OF cable is inserted into the cable terminal connection worked part insertion hole at an epoxy resin prefabricated connection unit body, which is composed of an embedded conductor where the cable terminal connection work inserting hole, into which the terminal connection worked part of a cable which is composed of a nearly cylindrical conductor and which is connected toward the central part from both ends of it can be inserted, and which is composed of an epoxy resin insulator which electrically insulates the outer circumferential part of the embedded conductor.