Provided are: a marine product aquaculture device having a simple structure, uniformly emitting ultrasonic waves, increasing the resistance of the fish, crustaceans, and shellfish that are being cultivated, and improving survival rates； and an aquaculture method therefor. The marine product aquaculture device comprises: a container (12) positioned so as to be movable either on the surface of or in water (30) in which marine products are being cultivated； and ultrasonic vibrators (14) attached to the container (12). The container (12) moves across the water surface or through the water and emits ultrasonic waves on to the marine products (26). The ultrasonic vibrators (14) are piezoelectric vibrators having a resonance frequency of 0.3-10 MHz. A plurality of ultrasonic vibrators (14) are provided in one container (12), the ultrasonic emission direction of each ultrasonic vibrator (14) is different, and the ultrasonic emission surface is inclined 3-45° to the water surface.
