Valve device

A valve device, comprising:

• a housing in which a valve chamber configured to communicate with an inside of a fuel tank on a lower side and a ventilation chamber configured to communicate with an outside of the fuel tank on an upper side are provided via a partition wall, and a valve hole configured to allow the valve chamber and the ventilation chamber to communicate with each other is formed in the partition wall;
• a float valve accommodated in the valve chamber so as to be raised and lowered, and configured to open and close the valve hole;
• and
• a float valve support portion provided on the housing and supporting the float valve, wherein
• the float valve support portion includes a support wall facing a bottom surface of the float valve, a side wall erected from a peripheral edge of the support wall and facing a side surface of the float valve, a first slit formed in the support wall, a second slit formed in the side wall, and an elastic piece defined by the first slit and the second slit,
• the elastic piece includes a first extending portion extending along the side wall, and a second extending portion extending from the first extending portion and capable of coming into contact with the bottom surface of the float valve, and
• the first extending portion of the elastic piece overlaps with the side wall when viewed from a direction in which the float valve can be raised and lowered.