a sewing machine comprises : a head portion having a sewing needle driven to vertically reciprocate ; a lower shaft having a shuttle connected thereto which is driven to rotate synchronized with the vertical movement of the sewing needle cooperating to form stitches ; a table positioned above the lower shaft ; a retainer positioned above the table to retain a material for forming stitches thereon ; a holding frame placed parallel to the table , the head portion being mounted at a position on the holding frame ; and supporting posts adapted to support opposite ends of the holding frame for positioning the holding frame above the table . the sewing machine allows a material to be sewn , which is retained retainer , to be easily mounted or removed .