A blower comprising: an actuator including a vibrating portion and a driving member, the vibrating portion including a first principal surface and a second principal surface, the driving member being provided on at least one of the first principal surface and the second principal surface of the vibrating portion, the driving member causing the vibrating portion to undergo bending vibration; and a housing (17, 117) including a first top plate portion, a second top plate portion, and a side wall portion (19, 119), the first top plate portion forming, together with the actuator, a first blower chamber and including a first vent hole, the second top plate portion forming, together with the actuator, a second blower chamber and including a second vent hole, the side wall portion (19, 119) connecting the first top plate portion and the vibrating portion and connecting the second top plate portion and the vibrating portion, wherein the vibrating portion includes an opening portion that allows an outer periphery of the first blower chamber and an outer periphery of the second blower chamber to communicate with each other, wherein the side wall portion (19, 119) includes a third vent hole that allows the outer periphery of the first blower chamber and the outer periphery of the second blower chamber to communicate with an outside of the housing (17, 117), characterized in that a first valve that prevents a gas from flowing into the first blower chamber from an outside of the first blower chamber is provided at the first vent hole, and a second valve that prevents the gas from flowing into the second blower chamber from an outside of the second blower chamber is provided at the second vent hole. an actuator including a vibrating portion and a driving member, the vibrating portion including a first principal surface and a second principal surface, the driving member being provided on at least one of the first principal surface and the second principal surface of the vibrating portion, the driving member causing the vibrating portion to undergo bending vibration; and a housing (17, 117) including a first top plate portion, a second top plate portion, and a side wall portion (19, 119), the first top plate portion forming, together with the actuator, a first blower chamber and including a first vent hole, the second top plate portion forming, together with the actuator, a second blower chamber and including a second vent hole, the side wall portion (19, 119) connecting the first top plate portion and the vibrating portion and connecting the second top plate portion and the vibrating portion, wherein the vibrating portion includes an opening portion that allows an outer periphery of the first blower chamber and an outer periphery of the second blower chamber to communicate with each other, wherein the side wall portion (19, 119) includes a third vent hole that allows the outer periphery of the first blower chamber and the outer periphery of the second blower chamber to communicate with an outside of the housing (17, 117), characterized in that a first valve that prevents a gas from flowing into the first blower chamber from an outside of the first blower chamber is provided at the first vent hole, and a second valve that prevents the gas from flowing into the second blower chamber from an outside of the second blower chamber is provided at the second vent hole.