PURPOSE: To easily bury and stick a coil part member to a transformer core, by connecting coil conductors in a manner that only the coil conductors are stacked on the periphery without stacking a flexible insulating part member on the periphery of a circular pipe.

CONSTITUTION: A plural connections coil part member 1 mainly consits of a plurality of coil part member 3, and a plurality of circular pipe connection parts 5 which collectively connect the parts between coil part members 3. The coil part member 3 consists of a flexible insulating part member 6 and coil conductor 7 formed on the flexible insulating part member 6. The circular pipe connection part 5 consists of flexible insulating part member 6 unified with the flexible insulating part member 6 on which the coil conductor 7 is formed. Each of the coil part members 3 is formed in a circular pipe type by rounding a belt type member. As to the respective end portions of the part members 6 of each coil part member 3, and the respective circular pipe connection parts 5 turning to the end portion side at the time of spread state, the superposition of joints are excluded when the members are formed in the circular pipe type.