To provide a cold milk transporting pipe having the effect of keeping in-factory transported cold milk cold.

An outer pipe 2 closed at both ends 3, 4 is provided on an outside of a cold milk transporting pipe 1 to form a double pipe, and air between the inner pipe 1 and the outer pipe 2 is ventilated to be rarefied. The double pipe units wherein a space between the inner pipe and the outer pipe is rarefied by ventilating air are successively provided throughout the length of the transporting pipe at short intervals.