Joint structure of resin members, resin housing of electrical equipment, and laser welding method

A laser welding method for joining together a first resin member having laser light absorbing property and a second resin member having laser light transmitting property through laser welding, the laser welding method comprising:

• preparing the first resin member including a first welding portion and the second resin member including a plate-shaped portion which has two main surfaces opposite to each other, and
• placing, on an upper side of the first welding portion, a second welding portion located at one end portion of one main surface out of the main surfaces of the second resin member, to bring the second welding portion into contact with the upper side;
• applying pressures to contact boundary surfaces of the first welding portion and the second welding portion in upward and downward directions;
• and
• applying laser light to the first welding portion from the second resin member side, to weld the first welding portion to the second welding portion, wherein
• warping, along the first welding portion, the one end portion side of the second resin member such that the warping occurs from a follow-up origin provided on one or each of the two main surfaces, to eliminate a gap between the contact boundary surfaces, when applying the pressure.