PURPOSE: To simplify work to assemble and disassemble forms and to increase the speed of the work by a method wherein square corner panels are coupled to a central panel through horizontal members by means of pins, and regulating bolts are mounted to the lower end parts of the corner panels to regulate the level.

CONSTITUTION: Side frames 1b and 2b formed of a square pipe are mounted to both side ends of a corner panel 1 and a central panel 2 on which a metallic sheet or a plywood is applied, and the four pieces are combined together to form columnar forms. Two coupling pieces 1c and 2c paralleling each other are mounted to the outside of the side frames 1b and 2b, coupling pins 4 are inserted in holes 1c and 2c in a state to nip a horizontal member 3 therebetween for integral formation to assemble them into columnar forms. A fastening bolt 3a is mounted to the end part of the horizontal member 3, and a level requlating bolt 5 is mounted to the lower end part of the corner panel 1. This constitution copes with the width of a column only by regulating a plate width, facilitates regulation of a level, and enables simplification of assembling and disassembling work and the increase of the speed of the work.