<p>A sewing machine includes: four or more supporting legs (2) having a shape replaceable with each other; and a bottom portion (15) including a mounting portion (52) with a height adjustment mechanism on which at least part of the supporting legs is mounted and mounting portions (51) on which the rest of the supporting legs are mounted, wherein the mounting portion with the height adjustment mechanism and the supporting leg to be mounted on the mounting portion with the height adjustment mechanism constitute a spiral contact engagement structure configured to allow an adjustment of the height of the contact engagement between two or more members in the height direction by rotating the mounted supporting leg about an axis extending substantially in the height direction.</p>
