A dish washer comprising: a tub forming a washing space; a spray module disposed inside the tub for spraying water to the washing space; a sump disposed under the tub for storing water; a washing pump for supplying the water stored in the sump to the spray module; and an air jet generator disposed below a bottom surface of the tub, the air jet generator is configured to receive a portion of the water discharged from the washing pump to generate and discharge water having air bubbles to the washing space of the tub, wherein the air jet generator includes: an air pulverizing pipe including a first pipe forming an inlet on a lower side of the first pipe and having a cross-sectional area reducing upward, a second pipe disposed above the first pipe and having a cross-sectional area increasing upward; and an air tab disposed at an upper portion of the second pipe and having a plurality of air holes, wherein an air inlet hole is formed in the air pulverizing pipe to introduce air from the outside at an inlet end portion of the second pipe; characterized in that the air pulverizing pipe includes an extended surface portion which extends in a radial direction at a discharge end portion of the first pipe and extends an area of flow path of the inlet end portion of the second pipe. a tub forming a washing space; a spray module disposed inside the tub for spraying water to the washing space; a sump disposed under the tub for storing water; a washing pump for supplying the water stored in the sump to the spray module; and an air jet generator disposed below a bottom surface of the tub, the air jet generator is configured to receive a portion of the water discharged from the washing pump to generate and discharge water having air bubbles to the washing space of the tub, wherein the air jet generator includes: an air pulverizing pipe including a first pipe forming an inlet on a lower side of the first pipe and having a cross-sectional area reducing upward, a second pipe disposed above the first pipe and having a cross-sectional area increasing upward; and an air tab disposed at an upper portion of the second pipe and having a plurality of air holes, wherein an air inlet hole is formed in the air pulverizing pipe to introduce air from the outside at an inlet end portion of the second pipe; characterized in that the air pulverizing pipe includes an extended surface portion which extends in a radial direction at a discharge end portion of the first pipe and extends an area of flow path of the inlet end portion of the second pipe. an air pulverizing pipe including a first pipe forming an inlet on a lower side of the first pipe and having a cross-sectional area reducing upward, a second pipe disposed above the first pipe and having a cross-sectional area increasing upward; and an air tab disposed at an upper portion of the second pipe and having a plurality of air holes, wherein an air inlet hole is formed in the air pulverizing pipe to introduce air from the outside at an inlet end portion of the second pipe; characterized in that the air pulverizing pipe includes an extended surface portion which extends in a radial direction at a discharge end portion of the first pipe and extends an area of flow path of the inlet end portion of the second pipe.