A laser processing method of irradiating a planar object to be processed with processing laser light while locating a light-converging point within the object so as to form a modified region to become a starting point region for cutting within the object along a line to cut the object; characterized in that the method comprising, when an entrance surface (r) of the processing laser light in the object is an irregular surface while the line to cut extends over a depressed area surface and a protruded area surface in the entrance surface (r): a first step of forming a first modified region inside by a predetermined distance from the depressed area surface along the line to cut; and a second step of forming a second modified region inside by a predetermined distance from the protruded area surface along the line to cut; wherein, in the first step, the light-converging point is located outside the object at the time of irradiation with the processing laser light along a part (51 a) on the protruded area surface in the line to cut; and wherein, in the second step, the light-converging point is located outside the object at the time of irradiation with the processing laser light along a part (51 b) on the depressed area surface in the line to cut. wherein, in the first step, an irradiation condition of the processing laser light is changed so as to position the light-converging point of the processing laser light inside by a predetermined distance from the depressed area surface at the time of irradiation with the processing laser light along a part (51 b) on the depressed area surface in the line to cut, and is fixed at the time of irradiation with the processing laser light along a part (51 a) on the protruded area surface in the line to cut; and wherein, in the second step, the irradiation condition of the processing laser light is changed so as to position the light-converging point of the processing laser light inside by a predetermined distance from the protruded area surface at the time of irradiation with the processing laser light along a part (51 a) on the protruded area surface in the line to cut, and is fixed at the time of irradiation with the processing laser light along a part (51 b) on the depressed area surface in the line to cut. a first step of forming a first modified region inside by a predetermined distance from the depressed area surface along the line to cut; and a second step of forming a second modified region inside by a predetermined distance from the protruded area surface along the line to cut; wherein, in the first step, the light-converging point is located outside the object at the time of irradiation with the processing laser light along a part (51 a) on the protruded area surface in the line to cut; and wherein, in the second step, the light-converging point is located outside the object at the time of irradiation with the processing laser light along a part (51 b) on the depressed area surface in the line to cut. wherein, in the first step, an irradiation condition of the processing laser light is changed so as to position the light-converging point of the processing laser light inside by a predetermined distance from the depressed area surface at the time of irradiation with the processing laser light along a part (51 b) on the depressed area surface in the line to cut, and is fixed at the time of irradiation with the processing laser light along a part (51 a) on the protruded area surface in the line to cut; and wherein, in the second step, the irradiation condition of the processing laser light is changed so as to position the light-converging point of the processing laser light inside by a predetermined distance from the protruded area surface at the time of irradiation with the processing laser light along a part (51 a) on the protruded area surface in the line to cut, and is fixed at the time of irradiation with the processing laser light along a part (51 b) on the depressed area surface in the line to cut.