Chair having a waist support and a back support

PURPOSE: A chair having a waist support and a back support is provided to effectively disperse load applied to waist. CONSTITUTION: A chair having a waist support and a back support comprises a seat(10); a column(20) which is combined to the rear side of the sheet and is extended upwards; a back support part(30) which has a C-shaped lateral shape, in coupled to the upper part of the column, and includes parts longitudinally protruded frontwards; and a coupling unit which combines the back support and the waist support to the back support column.