Patent ID: 8101885

Claim:
A laser processing method of irradiating respective surfaces of a plurality of objects each having a cylindrical form extending in a first direction with laser light, so as to process the plurality of objects, said laser processing method comprising steps of: arranging the plurality of objects on a first plane and on a reference line orthogonal to the first direction as viewing on one surface side of a second plane which is orthogonal to the first plane at the reference line; as viewing on the one surface side of the second plane, irradiating the plurality of objects with a first laser light beam at a first irradiation angle of 85° or less with respect to the reference line and from one surface side of the first plane, and irradiating the plurality of objects with a second laser light beam at a second irradiation angle of 95° or more with respect to the reference line and from the one surface side of the first plane; and during the first and second laser light beams are emitted, relatively reciprocating respective irradiation points of the first and second laser beams with respect to the first plane along the reference line.