We examine extinction effects of interstellar dust on galaxy counts for bulge-disk galaxies. Evolution of dust mass is calculated simultaneously with galaxy chemical evolution equations under the context of the so-called infall model, and three-dimensional radiative transfer calculation is performed with scattering effects. Prevailing importance of the bulge on dust mass evolution and photometric appearance in the early formation epoch of spiral galaxies is demonstrated. We here present the galaxy number-magnitude relation, N(m), in the B and K bands and the number-redshift relation, N(z), in the B band with internal absorption taken into account. We confirm that N(m) is differently affected by evolution and extinction between the B and K bands, and that the K band is more suitable to distinguish q0 values. We find that in the B band the extinction effects give a drastic change in N(m) in such a way that N(m) looks as if galaxies show only mild luminosity evolution. Three kinds of models—evolutionary, evolutionary with dust, and nonevolutionary—can be most clearly distinguished from the observations of N(z) in z = 0.8-1.2 in the range of magnitude B = 20-24. We conclude that the dusty evolution model of galaxies with properly adopted parameters can better satisfy both N(m) and N(z) distributions simultaneously than the others.