Provided is a flange member (1) used together with a tracheotomy tube (101), said flange member (1) having: an attachment part (2), to which the tracheotomy tube (101) is attached; and a plate-like flange body (3) provided with a suturing hole (20) and, on the outer peripheral edge (30), a recess (31) for engaging a suture thread.気管切開チューブ(101)とともに使用されるフランジ部材(1)であって、気管切開チューブ(101)が装着される装着部(2)と、縫合用孔(20)を備えるとともに外周縁(30)に縫合糸係止用凹部(31)を備える板状のフランジ本体(3)とを有する。