A method for forming a mark includes ejecting a droplet of a liquid from a
nozzle onto an ejection target position on a surface of an object along
an ejecting direction; radiating a laser beam from a radiation port onto
the ejection target position along a radiating direction; and pivoting
the nozzle and the radiation port together about the ejection target
position as a pivot center, thereby changing the angle between a normal
line of the surface of the object and the ejecting direction and the
angle between the normal line and the radiating direction while
maintaining the angle between the ejecting direction and the radiating
direction.