An algae culturing apparatus, comprising: a culture tank configured to accommodate algae and a culture solution for culturing the algae; and a flow generator installed on the culture tank, and configured to generate a flow of the culture solution from the center of the culture tank toward an inside wall part of the culture tank on a liquid surface of the culture solution and in a region of the culture solution close to the liquid surface by moving the culture solution on the liquid surface and in the region close to the liquid surface in the culture tank from the center of the culture tank toward the inside wall part of the culture tank, wherein the flow generator includes: a motor; a rotary shaft, one end portion of which is connected to the motor; a plurality of support members radially disposed about the rotary shaft, each of the plurality of support member being connected to other end portion of the rotary shaft on a base end portion thereof; and a plurality of blade members which are attached to tip portions of the support members, and wherein in a state where the rotary shaft is disposed so as to be orthogonal to the liquid surface of the culture solution accommodated in the culture tank, the plurality of blade members are disposed so as to be closer to the inside wall part of the culture tank than the rotary shaft, and are suspended from the support members to come into contact with the culture solution, a specific weight of the support member is lighter than that of the culture solution, and the support member is a floating buoyant material for securing buoyancy of the flow generator with respect to the culture solution, and the algae culturing apparatus further comprises a flow generator position regulation member which is configured to regulate a position of the flow generator at the center portion of the culture tank in a state where the flow generator floats on the culture solution. a culture tank configured to accommodate algae and a culture solution for culturing the algae; and a flow generator installed on the culture tank, and configured to generate a flow of the culture solution from the center of the culture tank toward an inside wall part of the culture tank on a liquid surface of the culture solution and in a region of the culture solution close to the liquid surface by moving the culture solution on the liquid surface and in the region close to the liquid surface in the culture tank from the center of the culture tank toward the inside wall part of the culture tank, wherein the flow generator includes: a motor; a rotary shaft, one end portion of which is connected to the motor; a plurality of support members radially disposed about the rotary shaft, each of the plurality of support member being connected to other end portion of the rotary shaft on a base end portion thereof; and a plurality of blade members which are attached to tip portions of the support members, and wherein in a state where the rotary shaft is disposed so as to be orthogonal to the liquid surface of the culture solution accommodated in the culture tank, the plurality of blade members are disposed so as to be closer to the inside wall part of the culture tank than the rotary shaft, and are suspended from the support members to come into contact with the culture solution, a specific weight of the support member is lighter than that of the culture solution, and the support member is a floating buoyant material for securing buoyancy of the flow generator with respect to the culture solution, and the algae culturing apparatus further comprises a flow generator position regulation member which is configured to regulate a position of the flow generator at the center portion of the culture tank in a state where the flow generator floats on the culture solution. a motor; a rotary shaft, one end portion of which is connected to the motor; a plurality of support members radially disposed about the rotary shaft, each of the plurality of support member being connected to other end portion of the rotary shaft on a base end portion thereof; and a plurality of blade members which are attached to tip portions of the support members, and wherein in a state where the rotary shaft is disposed so as to be orthogonal to the liquid surface of the culture solution accommodated in the culture tank, the plurality of blade members are disposed so as to be closer to the inside wall part of the culture tank than the rotary shaft, and are suspended from the support members to come into contact with the culture solution, a specific weight of the support member is lighter than that of the culture solution, and the support member is a floating buoyant material for securing buoyancy of the flow generator with respect to the culture solution, and the algae culturing apparatus further comprises a flow generator position regulation member which is configured to regulate a position of the flow generator at the center portion of the culture tank in a state where the flow generator floats on the culture solution.