An apparatus for circumcising a penis includes a fixture device (3) and a balanus ferrule (1). The fixture device (3) has an opening. An upper blade conjoined part (311A) and a lower blade 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 the lower blade conjoined part (311 B)
