Fuel tank check valve

A fuel tank check valve provided on a downstream side of a fuel supply pipe for supplying fuel to a fuel tank, the check valve comprising:

• a body tube having a connection portion connected to the fuel supply pipe on a base end side positioned on an upstream side in a fuel supply direction, and provided with a valve element housing having a valve seat on a tip end side positioned on a downstream side in the fuel supply direction;
• a valve element housed in the valve element housing slidably with respect to an axial direction of the body tube, and having a seal coming into contact with and separating from the valve seat;
• a cap assembled on a tip end side of the valve element housing;
• a spring supported by the cap and biasing the valve element in a direction abutting against the valve seat;
• and
• a locking portion provided between the valve element housing and the cap, wherein
• the valve element housing has an annular base end side frame provided with the valve seat in an inner periphery, an annular tip end side frame arranged on a tip end side relative to the base end side frame and to which the cap is mounted, and a plurality of circumferentially arranged first coupling frame axially coupling the base end side frame and the tip end side frame,
• the tip end side frame is provided with a retraction portion formed in such a manner that a circumferential part is retracted to the base end side frame side from a tip end surface,
• the cap is formed with a notch whose circumferential part is notched when the body tube is viewed from the axial tip end side, and
• the cap is assembled in the valve body housing so that the notch is positioned in the retraction portion.