A method of manufacturing a spacer nut, said spacer nut being adapted to be arranged between a casing and a board located inside the casing and serving to fix the board in position while keeping the board spaced apart from the casing by a predetermined distance dimension, the method characterised by comprising: 1) first step of forming a protrusion of a predetermined length on a metal plate material of a predetermined thickness dimension by press working; 2) a second step of: - forging the protrusion into a bottomed cylinder shaft portion by drawing said protrusion to reduce its diameter dimension and by crushing the bottom of said protrusion to form a distal end surface portion, - forming, at the distal end surface portion of the shaft portion, a tapered truncated cone shaped recess whose inner peripheral surface portion is gradually reduced in diameter toward a proximal end portion of the shaft, - forming a flange portion at a peripheral edge of the proximal end portion of the shaft portion by press working of the metal plate material, - removing a rounded portion formed between the proximal end portion of the shaft portion and the metal plate material to shape the shaft portion and the metal plate material so as to be orthogonal to each other; 3) a third step of forming an opening at a distal end portion of the shaft portion by press working; 4) a fourth step of performing pressing radially inwards on the proximal end portion of the shaft portion to form a groove portion extending circumferentially around the shaft portion; 5) a fifth step of stamping the flange portion from the metal plate material while forming a serration portion along an outer periphery of the flange portion by press working; and 6) a sixth step of forming a thread groove portion in an inner peripheral surface portion of the shaft portion. 1) first step of forming a protrusion of a predetermined length on a metal plate material of a predetermined thickness dimension by press working; 2) a second step of: - forging the protrusion into a bottomed cylinder shaft portion by drawing said protrusion to reduce its diameter dimension and by crushing the bottom of said protrusion to form a distal end surface portion, - forming, at the distal end surface portion of the shaft portion, a tapered truncated cone shaped recess whose inner peripheral surface portion is gradually reduced in diameter toward a proximal end portion of the shaft, - forming a flange portion at a peripheral edge of the proximal end portion of the shaft portion by press working of the metal plate material, - removing a rounded portion formed between the proximal end portion of the shaft portion and the metal plate material to shape the shaft portion and the metal plate material so as to be orthogonal to each other; - forging the protrusion into a bottomed cylinder shaft portion by drawing said protrusion to reduce its diameter dimension and by crushing the bottom of said protrusion to form a distal end surface portion, - forming, at the distal end surface portion of the shaft portion, a tapered truncated cone shaped recess whose inner peripheral surface portion is gradually reduced in diameter toward a proximal end portion of the shaft, - forming a flange portion at a peripheral edge of the proximal end portion of the shaft portion by press working of the metal plate material, - removing a rounded portion formed between the proximal end portion of the shaft portion and the metal plate material to shape the shaft portion and the metal plate material so as to be orthogonal to each other; 3) a third step of forming an opening at a distal end portion of the shaft portion by press working; 4) a fourth step of performing pressing radially inwards on the proximal end portion of the shaft portion to form a groove portion extending circumferentially around the shaft portion; 5) a fifth step of stamping the flange portion from the metal plate material while forming a serration portion along an outer periphery of the flange portion by press working; and 6) a sixth step of forming a thread groove portion in an inner peripheral surface portion of the shaft portion.