An apparatus for circumcising a penis includes a fixture device (3) and abalanus ferrule (1).The fixture device (3) has an opening. An upper blade conjoined part (311A)and a lowerblade conjoined part (311B) are provided on the either end of the opening.Round angles (311)are provided at the edges of the upper blade conjoined part (311A) and thelower bladeconjoined part (311B).