Abstract: The subject invention is aimed at providing a sole pad unit with the effects of supporting the metatarsal bone and airing and massaging the center of the sole of foot, comprising mainly of a massage block, roughly in an "L" shape, located on the sole pad unit to correspond to the depressive part on the sole of foot, providing proper stimulation to the depressed part on the sole of foot, complying with ergonomic principles, at approximately the center of the massage block is a vent hole to produce airing effect and prevent bad smell, meanwhile there are slopes on the peripherals to prevent deformation of the massage block, the sole pad unit is applicable to slippers as well as all types of shoes, to achieve the effects of universal application and best comfort, and to achieve the purpose of better health with the massage block to support the metatarsal bone and massage the reflective area of acupoints on the depressed part of the sole of foot.