A mute equipment capable of controlling a breath pressure and reducing the volume of the sound during a performance state in normal manner, an adapter thereof and the wind instruments equipped with them, are characterized in that it the mute equipment capable of controlling a breath pressure is to be attached to the blowing section of the wind instruments, wherein the equipment has a hole to release the breath and a section of restricting a wind way width. The mute equipment capable of controlling a breath pressure may be further characterized in that the equipment has a section of adjusting a breath volume to adjust the size of the hole to release the breath. The mute equipment capable of controlling a breath pressure may be further characterized in that the section of adjusting a breath volume can use as the section of restricting the wind way width.