An air supply device (100, 200) comprising: an enclosure having a sealed interior space for storing air therein; a pump provided outside the enclosure, the pump being configured to supply air to the interior space of the enclosure; and a flow path switching unit including a pedestal part mounted inside the enclosure, a rotating part rotatably mounted on the pedestal part, the rotating part having an enclosure interior space communication portion and a groove portion, and a drive unit configured to rotate the rotating part, the enclosure including an air supply port configured to supply air supplied from the pump to the interior space of the enclosure, an air discharge port configured to discharge air from the groove portion of the rotating part, and at least one object connection port configured to supply air to or exhaust air from at least one object, the pedestal part including at least one first hole that is communicated to the at least one object connection port, and a second hole that is communicated to the air discharge port, the enclosure interior space communication portion being communicated to the air supply port through the interior space of the enclosure, and the groove portion being separated from the enclosure interior space communication portion, characterized in that, when viewed from the pedestal part side, the enclosure interior space communication portion has an elliptical shape inwardly depressed, and the groove portion has a circular portion that is communicated to the second hole, and a protruding portion that is selectively communicated to the at least one first hole and that outwardly protrudes from the circular portion. an enclosure having a sealed interior space for storing air therein; a pump provided outside the enclosure, the pump being configured to supply air to the interior space of the enclosure; and a flow path switching unit including a pedestal part mounted inside the enclosure, a rotating part rotatably mounted on the pedestal part, the rotating part having an enclosure interior space communication portion and a groove portion, and a drive unit configured to rotate the rotating part, a pedestal part mounted inside the enclosure, a rotating part rotatably mounted on the pedestal part, the rotating part having an enclosure interior space communication portion and a groove portion, and a drive unit configured to rotate the rotating part, the enclosure including an air supply port configured to supply air supplied from the pump to the interior space of the enclosure, an air discharge port configured to discharge air from the groove portion of the rotating part, and at least one object connection port configured to supply air to or exhaust air from at least one object, an air supply port configured to supply air supplied from the pump to the interior space of the enclosure, an air discharge port configured to discharge air from the groove portion of the rotating part, and at least one object connection port configured to supply air to or exhaust air from at least one object, the pedestal part including at least one first hole that is communicated to the at least one object connection port, and a second hole that is communicated to the air discharge port, at least one first hole that is communicated to the at least one object connection port, and a second hole that is communicated to the air discharge port, the enclosure interior space communication portion being communicated to the air supply port through the interior space of the enclosure, and the groove portion being separated from the enclosure interior space communication portion, characterized in that, when viewed from the pedestal part side, the enclosure interior space communication portion has an elliptical shape inwardly depressed, and the groove portion has a circular portion that is communicated to the second hole, and a protruding portion that is selectively communicated to the at least one first hole and that outwardly protrudes from the circular portion. a circular portion that is communicated to the second hole, and a protruding portion that is selectively communicated to the at least one first hole and that outwardly protrudes from the circular portion.