Device for detecting at least two vital parameters, comprising at least an optical sensor device for capturing at least one vital parameter of a living being, wherein the optical sensor device comprises a radiation source for emitting radiation and a radiation detector for detecting radiation, wherein the radiation source and the radiation detector are arranged next to each other, a longitudinal insertion portion for insertion into an ear canal and for positioning the optical sensor device in a portion of the ear canal surrounded by bone, wherein the optical sensor device is arranged at the longitudinal insertion portion or is a component thereof and wherein a temperature sensor for capturing the body core temperature is arranged at the longitudinal insertion portion or is a component thereof, an evaluation portion coupled, in particular detachably coupled, to the insertion portion, wherein the evaluation portion and the optical sensor device are at least temporarily, in particular in a coupled state, signal-technically connected to one another, wherein the longitudinal insertion portion, which can be inserted into the ear canal, forms an inner end in its longitudinal direction and wherein the longitudinal insertion portion comprises or forms one or at least one sealing element for closing the ear canal, wherein the temperature sensor is arranged or formed between the inner end and the sealing element, characterized in that the radiation source is arranged or formed on a front side of a substrate for emitting radiation in the direction of a tympanic membrane in the extension direction of the insertion portion, and the radiation detector is arranged or formed on the front side of the substrate for detecting radiation from the direction of the tympanic membrane in the extension direction of the insertion portion, wherein the substrate is a PCB and wherein a radiation barrier is formed between the radiation source and the radiation detector, wherein the radiation source is formed as at least two light sources (28, 30), in particular a first LED or OLED and a second LED or OLED, for emitting radiation of different wavelengths. comprising at least an optical sensor device for capturing at least one vital parameter of a living being, wherein the optical sensor device comprises a radiation source for emitting radiation and a radiation detector for detecting radiation, wherein the radiation source and the radiation detector are arranged next to each other, a longitudinal insertion portion for insertion into an ear canal and for positioning the optical sensor device in a portion of the ear canal surrounded by bone, wherein the optical sensor device is arranged at the longitudinal insertion portion or is a component thereof and wherein a temperature sensor for capturing the body core temperature is arranged at the longitudinal insertion portion or is a component thereof, an evaluation portion coupled, in particular detachably coupled, to the insertion portion, wherein the evaluation portion and the optical sensor device are at least temporarily, in particular in a coupled state, signal-technically connected to one another, wherein the longitudinal insertion portion, which can be inserted into the ear canal, forms an inner end in its longitudinal direction and wherein the longitudinal insertion portion comprises or forms one or at least one sealing element for closing the ear canal, wherein the temperature sensor is arranged or formed between the inner end and the sealing element, characterized in that the radiation source is arranged or formed on a front side of a substrate for emitting radiation in the direction of a tympanic membrane in the extension direction of the insertion portion, and the radiation detector is arranged or formed on the front side of the substrate for detecting radiation from the direction of the tympanic membrane in the extension direction of the insertion portion, wherein the substrate is a PCB and wherein a radiation barrier is formed between the radiation source and the radiation detector, wherein the radiation source is formed as at least two light sources (28, 30), in particular a first LED or OLED and a second LED or OLED, for emitting radiation of different wavelengths.