The present invention provides a tidal current power generation device which utilizes kinetic energy of a tidal current to generate power, and allows easier installation. Lower parts of a pair of parallel caissons (20) are embedded in a sea floor (G) along the direction of a tidal current, and upper parts thereof are located in the sea. A pair of caisson upper bodies (21) respectively have inner surfaces between which a space narrows backward along the direction of the tidal current and thereafter widens again with a neutral plane interposed therebetween, and outer surfaces parallel to each other. A barge body (30) is disposed across the pair of parallel caisson upper bodies, and both the outer surfaces thereof along the direction of the tidal current are made flush with both the outer surfaces of both the caisson upper bodies. Axial flow water turbines (1d) each located in an area having a wide space between both the caisson upper bodies are vertically suspended, respectively, on a front part and a back part of the lower surface of the barge body. Impellers of water turbines (1a-1c) are located on the upper side of a barge deck (31) and on the right and left outer surfaces of a barge under the water surface.
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