Problem to be solved: To control the flow rate of a pump so that a culture solution can be returned to a carbon dioxide supply port before carbon dioxide is consumed in culturing microalgae in a tubular closed photobioreactor. Solution: The algae growing apparatus is provided with a reactor 3 composed of a glass tube 32 for growing the algae by synthesizing a culture solution containing algae, internal sensors 8 b and 8 c for measuring internal environmental factors of the culture solution at the outlet of the reactor 3, external sensors 9 a and 9 b provided near the outside of the reactor 3 for measuring external environmental factors, An inverter 9 c capable of controlling the flow rate of the pump by the output result of at least one of the internal sensor and the external sensor, A flow meter 61 for measuring the flow rate at which...

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