Problem to be solved: to provide fish sex discrimination device capable of discriminating the sex of fish without touching raw fish.The ultrasonic diagnostic apparatus part 3 capable of discriminating fish and females from the image by acquiring the image in the abdominal cavity based on the reflected wave obtained by irradiating the abdominal cavity of the fish in the fish road part by ultrasonic wave to the abdominal cavity of the fish in the fish road part by the ultrasonic wave of the fish in which the fish f is a swimming channel which can be able to swim, and the ultrasonic wave of the fish in the fish road part A light guiding portion 4 capable of irradiating light in the fishway portion near the ultrasonic vibrator is provided.As a result, the fish can be guided by light to the position where the ultrasonic diagnostic apparatus can diagnose, and the fish can be discriminated easily by ultrasonic wave without applying stress or injury to the fish without touching the fish directly.Diagram
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