NOVELTY - The power generating apparatus has a gas-liquid separator (4) that separates working medium (3) heated with heat-source fluid (1) into high temperature solution (6) and gaseous working medium (5). The gaseous working medium is supplied to generator drive device (7). A condenser (11), thermal-medium liquid feeding pump (12), and heat recovery device (14) are connected in series. An ejector (9) is driven by the high temperature solution heat-exchanged with working medium (13) so that the working medium (5b) exhausted from the generator drive device is sucked with the ejector.    USE - Temperature difference electric power generating apparatus used for generating electric power from solar heat and factory waste heat.    ADVANTAGE - Since the working medium exhausted from the generator drive device is sucked by the ejector, the low temperature side pressure of the generator drive device falls. Hence, the thermal cycle efficiency of the temperature difference electric power generating apparatus is improved, and the electric power generation output is increased. The need of installing pumps and tanks in the temperature difference electric power generating apparatus is eliminated, thus the structure of the power generating apparatus is simplified, and the power consumption of the power generating apparatus for continuation of thermal cycle is reduced. The size of the power generating apparatus is reduced, thus the installation space of the power generating apparatus is reduced, and the installation cost of the power generating apparatus is reduced. The power generating apparatus is handled and maintained easily.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the temperature difference electric power generating apparatus.    Heat-source fluid (1)    Working mediums (3,5,5b,13)    Gas-liquid separator (4)    High temperature solution (6)    Generator drive device (7)    Ejector (9)    Condenser (11)    Thermal-medium liquid feeding pump (12)    Heat recovery device (14)