NOVELTY - The generator has thermoelectric modules (40) mounted at an outer circumferential surface of a housing (50) to form multiple columns along longitudinal direction of the housing. Multiple coolant tubes (70) are mounted to closely attach the thermoelectric modules to the housing. First and second coolant containers (10a-d, 20a-d) are mounted at opposing ends of the coolant tubes such that the tubes positioned at sides along longitudinal direction of the housing are opened and coolant flows in and out of the first and second coolant containers.    USE - Thermoelectric generator for a vehicle.    ADVANTAGE - The coolant tubes are connected to be separated in a state in which the first and second coolant containers are separated, thus assembling and replacing components in an easy manner. The inflow of the coolant is performed at lower sides of the first and second coolant containers, and the outflow of the coolant is performed at upper sides of the first and second coolant containers, so that the circulation of the coolant can be efficiently performed. The generator improves electric power generation efficiency by maximizing a temperature difference between a heat source and a cooling source. The electric power generation is performed when the exhaust gas flows in an appropriate amount, and the exhaust gas is rapidly discharged when the exhaust gas flows in large amount, so that the decrease of an output power of an engine and overheating of the thermoelectric module can be prevented. The coolant tubes are connected to the first coolant container or the second coolant container by connecting elements or rubbers with elasticity, so that the assembly tolerance and a gap between the components can be achieved.    DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of a thermoelectric generator. '(Drawing includes non-English language text)'    Coolant containers (10a-d, 20a-d)    Thermoelectric modules (40)    Housing (50)    Coolant tubes (70)    Coolant inlet pipe (80)