To provide a bolting/unbolting device for form of a concrete pole, which can adopt a bolt on the market used for the bolting/unbolting device for the form of the concrete pole, and dispense with a square washer and a hollow cylindrical boss section of the conventional example, has great fastening strength, and is assembled with a simple operation.

The bolting/unbolting device has a constitution that: an upper part of a cylindrical body 30, both of whose side surfaces is chamfered in lower parts, is firmly installed on an upper surface in an opening of a flange 4 of an upper mold form 2, by a means of welding etc., and a lower part of a cylindrical body 30 protrudes down the flange 4 of the upper mold form 2; both flanges 4, 5 of the upper and lower mold forms 2, 3 are joined; a general bolt 31 is inserted, with a screw part upside, from the lower surface of an opening provided on the flange 5 of the lower mold form 3; the bolt 31 is inserted into a hollow part the cylindrical body 30 to protrude the screw part of the bolt 31 on the upper surface of the cylindrical body 30; and nuts 13, 13 are screwed to the screw part, so as to fasten or loosen the upper and lower forms 2, 3.