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.