A method for laser welding which comprises preparing a laser light transmitting resin member comprising a resin composition containing 100 parts by weight of a thermoplastic resin and 0.1 to 2 parts by weight of a white pigment having a refractive index of 2 to 2.8 and exhibiting a whitish color such as white, gray or a tint color, piling a resin member being at least partly capable of absorbing the laser light and irradiating the laser light onto the resin member, to thereby generate heat and weld the members.