To provide a fuel cutoff valve 10 capable of preventing spitting of fuel when feeding oil without inadvertently closing a connecting passage 32b with an ascending air current of fuel steam.

The fuel cutoff valve 10 is provided with a casing 20 having a valve chamber 30S, and a valve mechanism 50 having a float 51 and an upper valve element 55 liftably arranged at the upper part of the float 51 to open/close the connecting passage 32b. An air hole 33b formed at a side part of the casing 20, and a side part of the valve mechanism 50 form a throttle part. When a fuel liquid level reaches a first liquid level FL1, the throttle part increases ventilation resistance with the rise of the valve mechanism 50 to reduce a quantity of flow flowing from the connecting passage 32b to the outside. When the fuel liquid level reaches a second liquid level FL2 higher than the first liquid level FL1, the upper valve element 55 closes the connecting passage 32 with the rise of the valve mechanism 50.