Intake/exhaust valve device and vehicular seat device

A vehicle seat device comprising:

• a retaining member located inside a seat;
• and
• an inlet-outlet valve device retained by the retaining member, wherein
• the inlet-outlet valve device includes
• a main body to which an air tube having an air flow passage is coupled, and
• a first securing portion and a second securing portion secured to the retaining member,
• the first securing portion is secured to a first position on the retaining member with a first securing portion fastening member,
• the second securing portion is secured to a second position on the retaining member via a second securing portion fastening member,
• the second position on the retaining member or the second securing portion includes an insertion hole, the second securing portion fastening member, which secures the second securing portion to the second position, is inserted in the insertion hole, and
• the insertion hole extends in a direction that connects the first securing portion and the second securing portion.