Method for producing joined body of different materials and joined body of different materials

A method for producing a joined body comprising different materials joined together, the method comprising the steps of:

• preparing a metal substrate comprising two or more etched grooves on a surface thereof and burrs provided adjacent to each of the two or more etched grooves;
• sequentially placing a first resin layer and a second resin layer on the surface of the metal substrate;
• and
• irradiating a surface of the second resin layer with a laser, thereby fusing the first and second resin layers to form a laminate,
• wherein the first resin layer has a light transmittance of 20% to 70% at any one wavelength selected from a range of 800 nm to 1,100 nm,
• wherein the second resin layer has a light transmittance of 50% to 80% at the any one wavelength,
• wherein the surface of the metal substrate has a light reflectance of 50% or less at the any one wavelength,
• wherein a light absorption rate of the first resin layer at the any one wavelength selected from a range of 800 nm to 1,100 nm is 20% to 50%, and
• wherein the light transmittance of the first resin layer at the any one wavelength is lower than a light transmittance of the second resin layer at the any one wavelength.