A low pressure stop filter section (5) into which liquid flows, a decompression flow path (8) through which the liquid flowing in from the low pressure stop filter section (5) flows while depressurizing, and a diaphragm for changing the opening of the decompression flow path (8) A drip irrigation dripper (1) having a section (10) is disposed on the inner wall surface of the flow pipe (3) through which the irrigation liquid flows. The low-pressure stop filter part (5) has a hydrophobic surface and prevents inflow of irrigation liquid when the hydraulic pressure is lower than a set value. A diaphragm part (10) changes the opening degree of a decompression flow path (8) according to the hydraulic pressure of the irrigation liquid. The drip irrigation dripper (1) can be manufactured at a low cost by integral molding, and the drip irrigation apparatus having the drip irrigation dripper (1) stably discharges the irrigation liquid even when the hydraulic pressure is low. To do.液体が流入する低圧停止フィルタ部(5)、低圧停止フィルタ部(5)から流入した液体を減圧させつつ流通させる減圧流路(8)、および減圧流路(8)の開度を変更するダイヤフラム部(10)を有する点滴灌漑用ドリッパ(1)を、灌漑用液体が流れる流通管(3)の内壁面に配置する。低圧停止フィルタ部(5)は、疎水性の表面を有し、液圧が設定値よりも低いときの灌漑用液体の流入を防止する。ダイヤフラム部(10)は、灌漑用液体の液圧に応じて減圧流路(8)の開度を変更する。点滴灌漑用ドリッパ(1)は、一体成形により安価に製造することができ、点滴灌漑用ドリッパ(1)を有する点滴灌漑装置は、上記液圧が低いときも、灌漑用液体を安定して吐出する。