Cutting needle rotation device and sewing machine

A sewing machine comprising:

• a cutting needle rotation device that includes a mounting portion that is removably mounted on a needle bar of the sewing machine;
• a first member that is a member to which a cutting needle is affixed at an opposite end of the first member from the mounting portion, the cutting needle being provided with a cutting edge;
• a moving member that is positioned in a first position when the moving member does not receive an external force and that moves to a second position when the moving member receives an external force;
• and
• a rotation mechanism that, when the moving member is in the first position, holds the first member such that the cutting needle does not rotate about an axis of the cutting needle, and that, when the moving member moves from the first position to the second position and returns from the second position to the first position, rotates the first member such that the cutting needle rotates about the axis of the cutting needle axis by a specified angle of rotation in one direction.