In the present work the organic and mineral composition of 14 varietis of beans (Phaseolus vulgaris L.) commonly found in our markets were studied. The average value for misture was 11.6%, protein 21.5%, lipids 1.3%, polysaccharides 45.2%, soluble sugars 4.7% and ash 3.9%. Free amino ácido evere identified and yielded from 610 to 1442 mg/100 g. The mean values for the mineral macronutrients were (in %): phosphate 0.17, potassium 1.88, calcium 0.23, magnesium 0.24 and sulphur 2.23. The average contents of micronutrients were (in ppm): boron 24.3, zinc 47.9, copper 174, molibdenium 0.11, iron 330.8 and manganese 17.6. It was found a great variation in the boron (14.2 - 73.8), molibdenium (002 - 0,32) and iron (167.9 - 598.6 ppm) contents. All other components showed a small variation. It was concluded that common beans can be considered a good source of carbohydrates and minerals (macro and micronutrients), and a fairly good source of protein.