The invention relates a mixer for an exhaust system of an internal combustion engine. The mixer includes a pipe section, which borders a flow cross section, through which the exhaust gas flows, in the circumferential direction, and which extends in an axial direction from a first axial side to a second axial side, and a plurality of guide blades, which project from the pipe section at least on one of the axial sides, so as to protrude into the flow cross section. Guide blades on an axial side, which follow each other in the circumferential direction, include a first guide blade group, arranged on the respective axial side, axially offset in relation to the guide blades of the second guide blade group, to reduce a pressure drop. The invention further relates to a reactant conveying device which is provided with the mixer and is used for the exhaust device of the internal combustion engine and the exhaust system which is provided with the reactant conveying device and is used for the internal combustion engine.