A primary object of the present invention is to provide an air bag and a massage machine which can allow a person to select one of an appropriate pressure massage and an appropriate massage with an air bag. An arm air bag portion 600 includes base bodies 610, 620 each containing a frame and a resin molding product, one or more protruding portions 630 for pressure provided on the base bodies 610, 620 and one or more expansion and contraction bags 640, 650, 660, 670, 690 provided on the base bodies 610, 620 and provided around the one or more protruding portions 630 for pressure. An expansion height of each of the one or more expansion and contraction bags 640, 650, 660, 670, 690 is higher than a protruding height H of each of the one or more protruding portions.
