The present invention relates to a rudder for a ship, comprising a rudder bulb and, more specifically, to a rudder for a ship, comprising a rudder bulb, the rudder comprising a rudder bulb that protrudes in the direction of a propeller, and capable of increasing the propulsion efficiency of a ship as the front upper part and the front lower part of the rudder are formed to cross each other with the rudder bulb at the center. The rudder for a ship, comprising a rudder bulb of the present invention can decrease the occurrence of cavitation due to a propeller hub by having the rudder bulb, and has the benefit of saving the fuel and propelling efficiency of the ship by enabling easy movement of fluid by having the upper part and the lower part of a front part tilted in crossing directions to correspond to a rotational incident flow.
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