  We investigate the electronic states of underdoped La_{2-x}Sr_xCuO_4 (LSCO)
by using a microscopic model, i.e., t-t'-t''-J model, containing vertical
charge stripes. The numerically exact diagonalization calculation on small
clusters shows the consistent explanation of the physical properties in the
angle-resolved photoemission, neutron magnetic scattering and optical
conductivity experiments such as the antiphase domain and quasi-one-dimensional
charge transport. The pair correlation function of the d-channel is suppressed
by the stripes. These results demonstrate a crucial role of the stripes in LSCO
