An integrated solar energy utilization apparatus, comprising: at least one photovoltaic conversion member having a front side and a back side; at least one thermoelectric conversion member , wherein the thermoelectric conversion member is a temperature-difference power generation element including at least one first heat-conducting end for inflow of heat and at least one second heat-conducting end for outflow of heat, and when the temperature of the first heat-conducting end is higher than that of the second heat-conducting end , the thermoelectric conversion member outputs electric energy; wherein the thermoelectric conversion member is formed as a support of the photovoltaic conversion member with its first heat-conducting end fixed to the back side of the photovoltaic conversion member in a thermally conductive manner; and a transmission-type Fresnel lens for condensing sunlight to be provided to the front side of the photovoltaic conversion member , wherein the transmission-type Fresnel lens has at least one condensing and refracting surface, and the at least one condensing and refracting surface is a tooth surface having at least one Fresnel lens unit, characterized by a reflective Fresnel lens for condensing sunlight to be provided to the back side of the photovoltaic conversion member , wherein the reflective Fresnel lens has at least one condensing and refracting surface, and the at least one condensing and refracting surface is a tooth surface having at least one Fresnel lens unit, and the reflective Fresnel lens is provided with a reflective back side, wherein the photovoltaic conversion member is a double-sided element capable of absorbing incident sunlight from both of the front and back sides, wherein the photovoltaic conversion member is arranged between the transmission-type Fresnel lens and the reflective Fresnel lens , the thermoelectric conversion member has its second heat-conducting end fixed with respect to the reflective Fresnel lens . at least one photovoltaic conversion member having a front side and a back side; at least one thermoelectric conversion member , wherein the thermoelectric conversion member is a temperature-difference power generation element including at least one first heat-conducting end for inflow of heat and at least one second heat-conducting end for outflow of heat, and when the temperature of the first heat-conducting end is higher than that of the second heat-conducting end , the thermoelectric conversion member outputs electric energy; wherein the thermoelectric conversion member is formed as a support of the photovoltaic conversion member with its first heat-conducting end fixed to the back side of the photovoltaic conversion member in a thermally conductive manner; and a transmission-type Fresnel lens for condensing sunlight to be provided to the front side of the photovoltaic conversion member , wherein the transmission-type Fresnel lens has at least one condensing and refracting surface, and the at least one condensing and refracting surface is a tooth surface having at least one Fresnel lens unit, characterized by a reflective Fresnel lens for condensing sunlight to be provided to the back side of the photovoltaic conversion member , wherein the reflective Fresnel lens has at least one condensing and refracting surface, and the at least one condensing and refracting surface is a tooth surface having at least one Fresnel lens unit, and the reflective Fresnel lens is provided with a reflective back side, wherein the photovoltaic conversion member is a double-sided element capable of absorbing incident sunlight from both of the front and back sides, wherein the photovoltaic conversion member is arranged between the transmission-type Fresnel lens and the reflective Fresnel lens , the thermoelectric conversion member has its second heat-conducting end fixed with respect to the reflective Fresnel lens . <EOS>