Bubble removing unit and substrate treating apparatus including the same

An apparatus for treating a substrate, the apparatus comprising:

• a container having a treatment space in an interior thereof;
• a support unit situated in the treatment space to support the substrate;
• a liquid supply unit to supply a liquid to a substrate positioned on the support unit;
• and
• a bubble removing unit to remove bubbles from the liquid supplied by the liquid supply unit,
• wherein the bubble removing unit comprises:
• a body having an inner space, through which a liquid can flow;
• a liquid introducing pipe through which the liquid can be supplied to the body;
• a liquid discharging pipe through which the liquid, from which bubbles are removed, can be discharged from the body;
• a bubble discharging pipe through which the bubbles can be discharged from the inner space and connected to an upper surface of the body;
• and
• a rod-shaped bar situated in the inner space and a length of which extends in a lengthwise direction of the body, and
• wherein a variable cross-section part situated between the liquid introducing pipe and the liquid discharging pipe and a cross-section of which varies along the lengthwise direction of the body is provided in the inner space of the body.