The present invention concerns a capacitor microphone comprising a microphone housing having a sound inlet opening, a diaphragm and a counterpart electrode which is associated with the diaphragm and which is arranged at a small spacing relative to the diaphragm. In order to be able to construct such a capacitor microphone with the smallest possible dimensions with at the same time a high signal-noise ratio and without worsening the electro-acoustic parameters, it is proposed in accordance with the invention that the microphone housing has two housing portions of which the second housing portion is of a larger diameter than the first housing portion and the second housing portion is arranged in the form of a cap or sleeve over the first housing portion and the edge of the diaphragm is folded over the edge of the first housing portion and fixed to the outside of the first housing portion.