To improve a freedom degree of design related to a branch position, pipe direction, etc., by providing a first block body positioned in one side of a plane and a second block body positioned in the other side of the plane, and individually connecting a plurality of pipes to the first/second block body, also arranging the pipes in parallel relating to the plane.

In case of connecting pipes by utilizing a plane 2 as a dash panel partitioning inside an engine room and inside a cabin, in a vehicle, a block body 4 positioned in one side of the plane 2 and a block body 6 positioned in the other side of the plane 2 also irregularity fitted to the block body 4 by interposing the plane 2 are provided. Each block body 4, 6 has surface parts 10, 12 with a plurality of connection pipes connectable in an external peripheral location also parallel mounting surface parts 14, 16 relating to the plane 2, and the other block body can be connected to these mounting surface parts 14, 16. In this way, reduction of assembly man-hours, easy positioning at assembly time, etc., can be realized, and assembly workability can be improved.