A linear friction welding apparatus for welding weld joint surfaces of a pair of metal components together by use of a frictional heat generated between the weld joint surfaces of the pair of the metal components , the apparatus comprising: an oscillation table caused to reciprocate in an oscillation direction; and an oscillation jig provided on the oscillation table and configured to hold a first metal component of the pair of the metal components , characterized in that the oscillation jig comprising: an oscillation jig base connected to the oscillation table ; a first clamp member provided in the oscillation jig base ; a second clamp member located at a position opposed to the first clamp member in the oscillation direction and configured to hold the first metal component together with the first clamp member ; a link mechanism provided in the oscillation jig base , composed of a plurality of links connected together, connected to the second clamp member , and caused to extend and contract in the oscillation direction; and a clamp actuator configured to cause the link mechanism to extend and contract in the oscillation direction, wherein, when the first clamp member and the second clamp member hold the first metal component , a connection center line (CL) connecting connection centers (C1, C2, C3) of the respective links is made straight in the oscillation direction. an oscillation table caused to reciprocate in an oscillation direction; and an oscillation jig provided on the oscillation table and configured to hold a first metal component of the pair of the metal components , characterized in that the oscillation jig comprising: an oscillation jig base connected to the oscillation table ; a first clamp member provided in the oscillation jig base ; a second clamp member located at a position opposed to the first clamp member in the oscillation direction and configured to hold the first metal component together with the first clamp member ; a link mechanism provided in the oscillation jig base , composed of a plurality of links connected together, connected to the second clamp member , and caused to extend and contract in the oscillation direction; and a clamp actuator configured to cause the link mechanism to extend and contract in the oscillation direction, wherein, when the first clamp member and the second clamp member hold the first metal component , a connection center line (CL) connecting connection centers (C1, C2, C3) of the respective links is made straight in the oscillation direction. an oscillation jig base connected to the oscillation table ; a first clamp member provided in the oscillation jig base ; a second clamp member located at a position opposed to the first clamp member in the oscillation direction and configured to hold the first metal component together with the first clamp member ; a link mechanism provided in the oscillation jig base , composed of a plurality of links connected together, connected to the second clamp member , and caused to extend and contract in the oscillation direction; and a clamp actuator configured to cause the link mechanism to extend and contract in the oscillation direction, wherein, when the first clamp member and the second clamp member hold the first metal component , a connection center line (CL) connecting connection centers (C1, C2, C3) of the respective links is made straight in the oscillation direction. <EOS>