[en] Cross sections of the ₃He(e,e'p) reaction have been measured with the 600 MeV linear accelerator at Saclay and the two-spectrometer set-up of the experimental hall HE1. The data cover the following region for the missing energy Esub(m) and the proton recoil momentum k: 0 < Esub(m) < 80 MeV and 0 < k < 310 MeV/c. Three-body ground-state wave functions, which have been obtained from Faddeev and variational calculations, performed with realistic NN-potentials, are discussed in chapter II. In chapter III the coincidence cross section is discussed in the plane wave impulse approximation (PWIA). The spectral function and its sum rules are introduced. The linear accelerator, the experimental hall and the liquid ₃He target are described in chapter IV. The experimental procedure, the data analysis, and the corrections which have been applied to the data, are discussed in chapter V. The results of the experiment are presented in chapter VI. The (e,e'p) reaction has proven its capabilities in obtaining detailed information on nuclear structure properties as nucleon momentum density distributions and separation energies, although corrections due to FSI and MEC have to be considered. In the case of ₃He, the results can be compared to predictions of various calculational techniques, using realistic NN-potentials and thus serve as a test for NN-potential models. (Auth.)