A socket holder includes at least one holder body, at least one elastomer fixing device, and at least one socket. The at least one socket has an interior provided with a mounting hole mounted on the at least one holder body. The mounting hole has at least one groove. The at least one holder body is made of hard material. The at least one elastomer fixing device is made of soft material and has at least one arcuate protrusion protruding outward from the at least one holder body and locked in the at least one groove of the at least one socket. The at least one arcuate protrusion is deformed slightly and is allowed to enter the mounting hole of the at least one socket. Thus, the at least one elastomer fixing device is formed with the at least one arcuate protrusion to replace the conventional steel ball.