The normal spectral energy distribution in the spectra of main-sequence B stars of five subclasses is presented. Spectral classification and UBV photometry from the fourth edition of the BSC and spectrophotometry from three extensive spectrophotometric catalogs are used. The method of selecting unreddened stars is outlined. The good agreement between the mean color indices in the UBV system calculated for a sample of stars with spectrophotometry and for considerably larger samples of unreddened stars of the corresponding subclasses from the BSC confirms the reliability of the results obtained.