To reduce consumption of semiconductor materials, to provide wide-angle solar beam collecting capability, and to make systems flexible and compact, we propose integrated solar energy conversion systems with waveguide-type solar beam collectors having film structures. We design structures of solar beam collectors consisting of multilayer optical waveguides with vertical mirrors and estimate the solar beam collecting efficiencies using the beam propagation method and the finite difference time domain method. The efficiencies for vertical incident light beams of 600 nm wavelength increase from 62% to 87% with increasing the layer counts from 1 to 3. The efficiency for incident angle of 45° is 1.5 times larger in solar beam collectors with 45° and 30° mirrors than in those with only 45° mirrors. Almost the same light-beam-collecting characteristics are obtained for wavelengths of 400 and 800 nm, achieving overall light beam collecting efficiency of more than 60%. These results suggest that the solar beam collector consisting of multilayer optical waveguides with mirrors of different angles enables wide-angle light beam collecting.