PURPOSE: To attach firmly a holder which will be used for holding for example a chemical liquid conduit to a pipe such as an air pipe of a drug sprinkler, by inserting a head part of a holder having a holder section, the head part being a sphere in shape with the diametrically opposite sides headed, into a hole of a pipe that just has been blow molded, rotating the head part followed by cooling thereby securing it.

CONSTITUTION: A holder 15 has a holder section 15a at its lower part, a post 17 projected from a seat surface 16, and a head part 18 at the top of the post that is in the shape of a barrel. The head part of the holder 15 is inserted into a hole 1a, whose shape is in conformity with the head part 18 of the holder 15, formed in a wall of a blow molded pipe 1 that has just been removed from a mold and has not yet been cooled with the hole 1a and the heat part being fitted, then the head part 18 is rotated circumferentially in the hole 1a, and the holder 15 and the pipe 1 are cooled and secured together. A chemical liquid conduit 6 or the like will be held by the holder section 15a.