To provide an attachment for honing work installable in a small machine tool, and applying shaft directional vibration to the rotation of a main spindle.

A vibration holder 1 has a shank 2 installed on the main spindle S and a collet 29 for installing a honing work tool in a lower part, and is composed of a vibration holder body 3 and a body 11 having a rotation stopping block 12 detachably installed on a fixing block B of the machine tool on the outer periphery, and is characterized in that a spindle 4 for rotating together with the rotation of the shank 2 is vertically movably housed inside the vibration holder body 3; a rocking plate 17 arranged on the spindle 4 and an inclined plate 22 fixed to the body 11 are opposed; a freely rotatable rotary member 20 is installed on the rocking plate 17; and the spindle 4 is vibrated when this rotary member vertically moves by revolving by copying after the inclined face of the inclined plate 22.