Patent ID: 8181328

Claim:
A fixing method for fixing components together in which two components in the form of a first component and a second component are positioned such that they are mutually superimposed in predetermined relative positions, and are then fixed together, wherein the first component has at least two portions for engagement that are recessed in a contact surface thereof which is placed against the second component towards a surface thereof, and the second component is made of a thermoplastic resin and has at least two protruding portions that protrude from positions that correspond to the portions for engagement of the first component on a surface of the second component which is located on the opposite side from the contact surface thereof which is placed against the first component, and wherein the fixing method for fixing components together is provided with: a first step in which the contact surfaces of both the first component and the second component are placed against each other, and the positions of the portions for engagement and the protruding portions are matched together; and a second step in which, by pressing a transmitting component that transmits ultrasonic waves on the protruding portions of the second component, the second component is softened by the ultrasonic waves and forms engaging portions that are made to protrude into the portions for engagement of the first component and become engaged with these portions for engagement.