In an irrigation hose made of a thermoplastic resin pipe which is longitudinally partitioned by a diaphragm into a constant pressure passage and a supply passage, the constant pressure passage having small bores for water-sprinkling spaced along the length of the resin-pipe wall, and the diaphragm having small bores for communication between the passages in the longitudinal direction thereof, the improvement for assuring uniform water-sprinkling from an irrigation hose which comprises forming projections on the diaphragm separating the passages from each other, at positions spaced along the length of the diaphragm, into the constant pressure passage to contact intimately with the resin-pipe wall of said passage, thereby forming barriers to said passage.
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