Rotary valve

A rotary valve that sequentially expands and contracts a plurality of air bags by switching an air-supply mode to the plurality of air bags, the rotary valve comprising:

• a lower case that defines an air chamber to which air is supplied from a pump;
• an upper case that has a plurality of connecting flow paths whose downstream ends are connected to the plurality of air bags, respectively, and an opening surface at which upstream ends of the plurality of connecting flow paths open, and that is stacked above the lower case;
• and
• a rotary that is accommodated in the upper case and has an air-supply flow path connected to the air chamber, and that sequentially switches the connecting flow paths connected to the air-supply flow path by rotating about an axis extending in a vertical direction in a state of being in contact with the opening surface of the upper case according to an increase and a decrease in pressure in the air chamber, wherein
• one of the upper case and the rotary has a locking portion that is locked to the other of the upper case and the rotary and that allows rotation of the rotary about the axis extending in the vertical direction while restricting movement of the rotary in the vertical direction.