A waste heat recovery device, in particular for an internal combustion engine, preferentially in a motor vehicle, - with a waste heat recovery circuit, in which a working medium circulates, - with at least one steam generator which is arranged in a waste heat recovery circuit for evaporating the working medium, - with an expansion machine which is arranged in the waste heat recovery circuit downstream of the steam generator for expanding the working medium, - with a condenser which is arranged in the waste heat recovery circuit downstream of the expansion machine for condensing the working medium, - with a delivery device which is arranged in the waste heat recovery circuit downstream of the condenser for driving the working medium in the circuit, - wherein the steam generator comprises a heat exchanger channel, in which a heat exchanger is arranged, - wherein the steam generator comprises a bypass channel for bypassing the heat exchanger channel, - wherein the heat exchanger channel and the bypass channel can be subjected to a through-flow of a heating fluid during the operation of the steam generator, - wherein the heat exchanger can be subjected to a through-flow of a medium to be evaporated during the operation of the steam generator, - wherein the heat exchanger of the steam generator is fluidically incorporated in the waste heat recovery circuit, - wherein during the operation of the waste heat recovery device the heat exchanger channel of the steam generator is subjected to the through-flow of exhaust gas of the internal combustion engine, characterized in that - the heat exchanger channel envelopes the bypass channel, and - a thermal insulating layer is arranged between the heat exchanger channel and the bypass channel. - with a waste heat recovery circuit, in which a working medium circulates, - with at least one steam generator which is arranged in a waste heat recovery circuit for evaporating the working medium, - with an expansion machine which is arranged in the waste heat recovery circuit downstream of the steam generator for expanding the working medium, - with a condenser which is arranged in the waste heat recovery circuit downstream of the expansion machine for condensing the working medium, - with a delivery device which is arranged in the waste heat recovery circuit downstream of the condenser for driving the working medium in the circuit, - wherein the steam generator comprises a heat exchanger channel, in which a heat exchanger is arranged, - wherein the steam generator comprises a bypass channel for bypassing the heat exchanger channel, - wherein the heat exchanger channel and the bypass channel can be subjected to a through-flow of a heating fluid during the operation of the steam generator, - wherein the heat exchanger can be subjected to a through-flow of a medium to be evaporated during the operation of the steam generator, - wherein the heat exchanger of the steam generator is fluidically incorporated in the waste heat recovery circuit, - wherein during the operation of the waste heat recovery device the heat exchanger channel of the steam generator is subjected to the through-flow of exhaust gas of the internal combustion engine, - the heat exchanger channel envelopes the bypass channel, and - a thermal insulating layer is arranged between the heat exchanger channel and the bypass channel.