The present invention relates to a helm used for steering device of a small ship such as a motor boat, the helm for steering device of the ship according to the present invention is connected to the steering shaft of the steering wheel of the ship rotates, for adjusting the rudder on the outer peripheral surface A helm for a steering device of a ship having a gear groove to which a cable is engaged, comprising: a disk-shaped first helical body formed in a circumferential direction with a portion of a gear groove formed at an outer circumferential edge of an upper surface; A complete gear groove together with a portion of the gear groove portion of the first helical body, fixedly coupled to the upper surface of the first helical body, made by casting molding, and at the outer periphery of the lower surface in contact with the upper surface of the first helical body; The remaining portion of the gear groove portion to form a portion is characterized in that it comprises a disk-shaped second helm body formed along the circumferential direction.;According to the present invention, it is possible to form the gear teeth of the gear groove portion on the outer circumferential surface of the helm, and to prevent the occurrence of bubbles in the formation process of the gear groove portion to prevent operation errors, and improve the durability.;Vessel, motorboat, steering system, steering module, helm, casting molding, gear groove
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