[Problem] To provide a fish egg processing apparatus capable of performing predetermined processing on fertilized eggs with higher efficiency, and collecting proper fish eggs.[Solution] When a housing recess that houses fish eggs one by one is conveyed to a predetermined processing position, and a capillary is raised and lowered to inject a gene solution, the housing recess is imaged from a direction that intersects a depth direction and a conveying-in direction, and an injection operation by the capillary is controlled by determining, along a possibility determination flow, whether to inject a predetermined substance into each of the fish eggs before processing, based on a previously determined condition.
