To provide a laser marking technique for marking a plurality of colors on one body to be emitted and providing marks of characters, pictures, symbols and the like of high grade on the surface of a resin product and also a molded product obtained by the technique.

A laser marking method is used for emitting laser beams onto a resin composition B containing an adding material A generating the color change and foaming by emitting the laser beams and to be foamed by the emission of the laser beams, and marking is carried out by changing set conditions of the laser beams used for the marking of the same body to be emitted.