The middle iron (3) is provided between the upper iron (1) and the lower iron (2). One of a trouser leg (4a) is set between the middle iron (3) and the lower iron (2) and the other of a trouser leg (4b) is set between the middle iron (3) and the upper iron (1). Both legs (4a, 4b) of the trouser (4) are held by the upper iron (1), the middle iron (3) and the lower iron (2) and pressed. This disclosure relates to the middle iron (3) such as the type of trouser-pressing machine.At the middle iron (3), in one side end part (3a) which the crotch (4c) of the trouser (4) setting on, only a portion (3b) corresponding to the crotch (4c) is formed to tapered shape gradually thinning toward the side of the middle iron (3).