To provide a vacuum anchor as a device to be used more safely while a temporary installation such as a sign board is sucked and fixed to the ground surface or wall surface by using vacuum suction.

A temporary installation fixing device has a vacuum pump 1 to generate a vacuum and a vacuum pad 3 furnished with a rubber pad 11 contacting with the ground surface or wall surface 5 made of concrete etc. as the member to be connected, whereby suction and fixation are performed by making vacuum the space between the rubber pad 11 and the ground surface or wall surface 5, and after the service, the outside air is drawn in for separation by shutting off the power to the vacuum pump 1 for opening a vacuum removal valve 9.